Chief: Man who shot Dallas police wanted to kill more officers

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Who was Micah Johnson?

DALLAS, July 11 (Reuters) - The U.S. military veteran who fatally shot five Dallas police officers in a racially motivated attack last week asked negotiators how many people he had shot and told them he wanted to kill more, the city's police chief said on Monday.

Explosives found at the home of gunman Micah Johnson suggested he had been plotting a larger assault, said authorities, who were still trying to understand a message he wrote in his own blood on a wall before being killed by a bomb-equipped robot sent in by the police.

SEE ALSO: Dallas shootings took heavy toll on officers of the Southwest Division

"We knew through negotiations this was the suspect because he was asking us how many did he get and he told us how many more he wanted to kill," Dallas Police Chief David Brown told reporters on Monday.

The attack on Thursday night came at the end of a demonstration over police shootings that had been prompted by incidents earlier in the week in which police in Baton Rouge, Louisiana, and St. Paul, Minnesota, killed two black men.

Johnson, a 25-year-old African-American, told police negotiators during an hours-long standoff that he had been angered by those deaths and had wanted to "kill white people."

The deaths in Baton Rouge and St. Paul were the latest in a series of high-profile and controversial killings of black men by police in cities including New York, Ferguson, Missouri, Chicago and Baltimore.

See photos of the protests across the U.S.

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Protests around country over Alton Sterling, Philando Castile shootings
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Protests around country over Alton Sterling, Philando Castile shootings
ST. PAUL, MN - JULY 09: Protestors yell at police from a bridge on July 9, 2016 in St. Paul, Minnesota. A protest shut down highway I-94 during a march to commemorate Philando Castile who was killed by police on June 6, 2016 in Falcon Heights, Minnesota. (Photo by Stephen Maturen/Getty Images)
ST. PAUL, MN - JULY 09: Police officers launch smoke bombs and tear gas to clear out protestors who shut down highway I-94 on July 9, 2016 in St. Paul, Minnesota. Protests and marches have occurred every day since the police killing of Philando Castile on June 6, 2016 in Falcon Heights, Minnesota. (Photo by Stephen Maturen/Getty Images)
ST. PAUL, MN - JULY 09: Police officers line up to clear out protestors who shut down highway I-94 on July 9, 2016 in St. Paul, Minnesota. Protests and marches have occurred every day since the police killing of Philando Castile on June 6, 2016 in Falcon Heights, Minnesota. (Photo by Stephen Maturen/Getty Images)
ST. PAUL, MN - JULY 09: Police officers launch smoke bombs and tear gas to clear out protestors who shut down highway I-94 on July 9, 2016 in St. Paul, Minnesota. Protests and marches have occurred every day since the police killing of Philando Castile on June 6, 2016 in Falcon Heights, Minnesota. (Photo by Stephen Maturen/Getty Images)
BATON ROUGE, LA -JULY 09: Protesters lock arms and shout at law enforcement in riot gear on July 9, 2016 in Baton Rouge, Louisiana. Alton Sterling was shot by a police officer in front of the Triple S Food Mart in Baton Rouge on July 5th, leading the Department of Justice to open a civil rights investigation. (Photo by Mark Wallheiser/Getty Images)
ST. PAUL, MN - JULY 09: Protestors shut down highway I-94 on July 9, 2016 in St. Paul, Minnesota. Protests and marches have occurred every day since the police killing of Philando Castile on June 6, 2016 in Falcon Heights, Minnesota. (Photo by Stephen Maturen/Getty Images)
BATON ROUGE, LA -JULY 09: Baton Rouge police removed protesters that were arrested on July 9, 2016 in Baton Rouge, Louisiana. Alton Sterling was shot by a police officer in front of the Triple S Food Mart in Baton Rouge on July 5th, leading the Department of Justice to open a civil rights investigation. (Photo by Mark Wallheiser/Getty Images)
ST. PAUL, MN - JULY 09: A protestor is held back by another man on shut down highway I-94 on July 9, 2016 in St. Paul, Minnesota. Protests and marches have happened every day since the police killing of Philando Castile on June 6, 2016 in Falcon Heights, Minnesota. (Photo by Stephen Maturen/Getty Images)
ST. PAUL, MN - JULY 09: Protestors shut down highway I-94 on July 9, 2016 in St. Paul, Minnesota. Protests and marches have occurred every day since the police killing of Philando Castile on June 6, 2016 in Falcon Heights, Minnesota. (Ph22oto by Stephen Maturen/Getty Images)
ST. PAUL, MN - JULY 09: A protestor raises his fist on shut down highway I-94 on July 9, 2016 in St. Paul, Minnesota. Protests and marches have occurred every day since the police killing of Philando Castile on June 6, 2016 in Falcon Heights, Minnesota. (Photo by Stephen Maturen/Getty Images)
ST. PAUL, MN - JULY 09: Police line up as protestors shut down highway I-94 on July 9, 2016 in St. Paul, Minnesota. Protests and marches have occurred every day since the police killing of Philando Castile on June 6, 2016 in Falcon Heights, Minnesota. (Photo by Stephen Maturen/Getty Images)
ST. PAUL, MN - JULY 09: A police officer gives commands as protestors shut down highway I-94 on July 9, 2016 in St. Paul, Minnesota. Protests and marches have occurred every day since the police killing of Philando Castile on June 6, 2016 in Falcon Heights, Minnesota. (Photo by Stephen Maturen/Getty Images)
ST. PAUL, MN - JULY 09: Protestors raise their hands as police attempt to move them off highway I-94 which they shut down on July 9, 2016 in St. Paul, Minnesota. Protests and marches have occurred every day since the police killing of Philando Castile on June 6, 2016 in Falcon Heights, Minnesota. (Photo by Stephen Maturen/Getty Images)
Police arrest activist DeRay McKesson during a protest along Airline Highway, a major road that passes in front of the Baton Rouge Police Department headquarters Saturday, July 9, 2016, in Baton Rouge, La. Protesters angry over the fatal shooting of Alton Sterling by two white Baton Rouge police officers rallied Saturday at the convenience store where he was shot, in front of the city's police department and at the state Capitol for another day of demonstrations. (AP Photo/Max Becherer)
A man and woman who had an exchange with protesters are arrested Saturday, July 9, 2016, in Baton Rouge, La. People were protesting the shooting death of a black man, Alton Sterling, by two white police officers at a convenience store parking lot last week. (AP Photo/Max Becherer)
Protesters block Airline Highway, a major road that passes in front of the Baton Rouge Police Department headquarters, Saturday, July 9, 2016, as they protest the shooting death of a black man, Alton Sterling, by two white police officers at a convenience store parking lot last week in Baton Rouge, La. (AP Photo/Max Becherer)
Police arrest a man for blocking a road in near the Baton Rouge Police Department headquarters Saturday, July 9, 2016, as people protest the shooting death of a black man, Alton Sterling, by two white police officers at a convenience store parking lot last week in Baton Rouge, La. (AP Photo/Max Becherer)
Sherif Deputies ride outside an armored vehicle on Airline Highway, a major road that passes in front of the Baton Rouge Police Department headquarters, as they attempt to clear protestors from the road in Baton Rouge, La., Saturday, July 9, 2016. Several hundred protesters continued blocking the road into the night causing police to arrest several people. (AP Photo/Max Becherer)
Protesters block Airline Highway, a major road that passes in front of the Baton Rouge Police Department headquarters, Saturday, July 9, 2016, as they protest the shooting death of a black man, Alton Sterling, by two white police officers at a convenience store parking lot last week in Baton Rouge, La. (AP Photo/Max Becherer)
Law enforcement form a line across Interstate 94 on Saturday, July 9, 2016, in St. Paul, Minn., in response to protesters who blocked the highway. The protesters were rallying in response to the death of Philando Castile, who was shot and killed by a suburban St. Paul police officer on July 6. (AP Photo/Joe Danborn)
A protester watches as police in riot gear clear the street of protesters in front of the Baton Rouge Police Department headquarters in Baton Rouge, La., Saturday, July 9, 2016. (AP Photo/Max Becherer)
Members of the New Black Panther Party face police in riot gear in front of the Baton Rouge Police Department headquarters as police attempt to clear the protesters from the street in Baton Rouge, La., Saturday, July 9, 2016. (AP Photo/Max Becherer)
A protester yells at police in front of the Baton Rouge Police Department headquarters after police arrived in riot gear to clear protesters from the street in Baton Rouge, La., Saturday, July 9, 2016. Several protesters were arrested. (AP Photo/Max Becherer)
Police arrest a protester in front of the Baton Rouge Police Department headquarters after police attempted to clear protesters from the street in Baton Rouge, La., Saturday, July 9, 2016. Several protesters were arrested. (AP Photo/Max Becherer)
A protester yells at police in front of the Baton Rouge Police Department headquarters after police arrived in riot gear to clear protesters from the street in Baton Rouge, La., Saturday, July 9, 2016. Several protesters were arrested. (AP Photo/Max Becherer)
Members of the New Black Panther Party march in front of the Baton Rouge Police Department headquarters in support of justice for Alton Sterling, who was killed by police, in Baton Rouge, La., Saturday, July 9, 2016. (AP Photo/Max Becherer)
Protesters are allowed to cross back over the street after police cleared the roadway in front of the Baton Rouge Police Department headquarters in Baton Rouge, La., Saturday, July 9, 2016. Several protesters were arrested. (AP Photo/Max Becherer)
Protestors shout slogans during a protest in Times Square in support of the Black lives matter movement in New York on July 09, 2016. The gunman behind a sniper-style attack in Dallas was an Army veteran and loner driven to exact revenge on white officers after the recent deaths of two black men at the hands of police, authorities have said. Micah Johnson, 25, had no criminal history, Dallas police said in a statement. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
Police officers stand guard during a protest in Times Square in support of the Black lives matter movement in New York on July 09, 2016. The gunman behind a sniper-style attack in Dallas was an Army veteran and loner driven to exact revenge on white officers after the recent deaths of two black men at the hands of police, authorities have said. Micah Johnson, 25, had no criminal history, Dallas police said in a statement. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
Police officers stand guard during a protest in Times Square in support of the Black lives matter movement in New York on July 09, 2016. The gunman behind a sniper-style attack in Dallas was an Army veteran and loner driven to exact revenge on white officers after the recent deaths of two black men at the hands of police, authorities have said. Micah Johnson, 25, had no criminal history, Dallas police said in a statement. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
People shout slogans during a protest in support of the Black lives matter movement in New York on July 09, 2016. The gunman behind a sniper-style attack in Dallas was an Army veteran and loner driven to exact revenge on white officers after the recent deaths of two black men at the hands of police, authorities have said. Micah Johnson, 25, had no criminal history, Dallas police said in a statement. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
A protestor shouts slogans during a protest in support of the Black lives matter movement in New York on July 09, 2016. The gunman behind a sniper-style attack in Dallas was an Army veteran and loner driven to exact revenge on white officers after the recent deaths of two black men at the hands of police, authorities have said. Micah Johnson, 25, had no criminal history, Dallas police said in a statement. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
People gather in Union Square during a protest in support of the Black lives matter movement in New York on July 09, 2016. The gunman behind a sniper-style attack in Dallas was an Army veteran and loner driven to exact revenge on white officers after the recent deaths of two black men at the hands of police, authorities have said. Micah Johnson, 25, had no criminal history, Dallas police said in a statement. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
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Even as officials and activists condemned the shootings and mourned the slain officers in Dallas, hundreds of people were arrested on Saturday and Sunday as new protests against the use of deadly force by police flared in U.S. cities.

Scores of people were arrested in Baton Rouge on Sunday after authorities warned that violence during street demonstrations would not be tolerated.

Brown said a search of Johnson's home showed the gunman had practiced using explosives, and that other evidence suggested he wanted to use them against law enforcement officers.

His attack was the deadliest day for U.S. law enforcement since the hijacked plane attacks of Sept. 11, 2001. Nine law enforcement officers were also wounded, Brown said on Monday.

'DISAPPOINTED' WITH MILITARY

Johnson, who had served with the U.S. Army Reserve and had been deployed in Afghanistan, had been "disappointed" in his experience with the military, his mother told TheBlaze.com in an interview broadcast online on Monday.

"The military was not what Micah thought it would be," Delphine Johnson told The Blaze. "He was very disappointed. Very disappointed." She did not give details.

Several media organizations have reported that while Johnson was in Afghanistan from November 2013 to July 2014, a woman soldier in his unit accused him of sexual harassment.

The U.S. Department of Defense and a lawyer who had represented Johnson in the past did not return requests for information on his military history or the status of his discharge.

In Baton Rouge, protesters faced off with police officers wearing gas masks on Sunday evening. Media, citing Baton Rouge police, reported that at least 48 people were taken into custody after demonstrators clashed with police following a peaceful march to the state capitol.

In St. Paul, Minnesota, 21 officers were injured on Saturday when they were pelted with rocks, bottles, construction material and fireworks.

Three countries have warned their citizens to stay on guard when visiting U.S. cities rocked by the protests.

A candlelight vigil was set for 8 p.m. on Monday in Dallas City Hall plaza. President Barack Obama was due to travel to the city on Tuesday to attend a memorial for the slain officers.

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