Orlando gunman Omar Mateen 'cool and calm' during negotiations

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Omar Mateen: What we know about Orlando nightclub gunman

The gunman who killed dozens and took hostages at an Orlando nightclub was "cool and calm" in a phone call with police negotiators, officials revealed Monday.

Fifty people — including the gunman — died in the attack on Orlando's Pulse nightclub early Sunday. More than 50 others were wounded.

Amid an ongoing investigation into a possible motive, Orlando Police Chief John Mina gave more details Monday on the run-up to the SWAT raid that ended the crisis.

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He told an early-morning press conference that gunman Omar Mateen had holed up in a bathroom with hostages after an initial shootout with police.

Mateen was "cool and calm" in a conversation with negotiators, according to Mina.

"He really wasn't asking for a whole lot," Mina said. "We were doing most of the asking."

There was talk of "bombs and explosives" — plus a reference to ISIS, according to Mina.

He said that once information from hostages and the suspect suggested "further loss of life was imminent," a decision was taken for SWAT to breach the wall of the club.

Mateen was armed with an assault-style weapon and a pistol. A third weapon was found in his car, authorities said Monday.

Around 100 leads have emerged in the ongoing investigation.

"No stone will be left unturned and we'll follow the leads wherever they take us," FBI special agent Paul Wyposal told Monday's press conference.

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U.S. Attorney Lee Bentley III said there was "no reason to believe" anyone connected to the crime posed an "imminent danger" to the public.

Teams of agents have been working "around the clock" to process a "great amount" of electronic and physical evidence, he added, saying the investigation was "still in the early stages."

Mateen first came to the FBI's attention in 2013 after co-workers reported he'd made "inflammatory" comments to them about radical Islamic propaganda.

Related: Two Attackers, One City — Why Gunman Was on FBI's Radar

A year later the FBI looked into him again because of his ties to an American who traveled to the Middle East to become a suicide bomber. Agents determined contact there was minimal and Mateen was not under surveillance on Sunday, when he carried out the deadliest mass shooting in U.S. history.

Law enforcement sources earlier told NBC News that Mateen swore allegiance to the leader of ISIS in a 911 call moments before the rampage at Pulse.

However, law enforcement officials have said there was not yet any indication Mateen was in touch with terrorists overseas or that the attack was directed by anyone else.

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As the investigation continued officials were working to notify victims' next-of-kin. Orlando Mayor Buddy Dyer said 48 of the 49 victims had been identified and 24 next of kin had been contacted.

He praised the heroics of responding officers and medical personnel, saying that "hundreds of lives were saved."

"We will not be defined by the act of a cowardly hater," Dyer told a press conference. "We will be defined by how we respond.

RELATED: Orlando massacre vigils and tributes around the world

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Orlando massacre vigils and tributes around the World
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Orlando gunman Omar Mateen 'cool and calm' during negotiations
People gather in front of the US Embassy in Copenhagen to remember the victims at the nightclub Pulse in Orlando Florida on June 13, 2016. / AFP / Scanpix / Jens Astrup / Denmark OUT (Photo credit should read JENS ASTRUP/AFP/Getty Images)
April Ross looks at a makeshift memorial outside the Dr. Phillips Center for the Performing Arts for the mass shooting victims at the Pulse nightclub June 13, 2016 in Orlando, Florida. The American gunman who launched a murderous assault on a gay nightclub in Orlando was radicalized by Islamist propaganda, officials said Monday, as they grappled with the worst terror attack on US soil since 9/11. The Islamic State group claimed slain shooter Omar Mateen was acting as 'one of the soldiers of the caliphate in America' when he attacked the Pulse club in the Florida resort city, an assault that ended when police stormed the venue. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
People lay flowers and light candles to commemorate victims of a mass shooting at a gay nightclub in Orlando in front of the US embassy in Warsaw on June 13, 2016. / AFP / AFP PHOTO / WOJTEK RADWANSKI (Photo credit should read WOJTEK RADWANSKI/AFP/Getty Images)
People commemorate victims of a mass shooting at a gay nightclub in Orlando in front of the US embassy in Warsaw on June 13, 2016. / AFP / AFP PHOTO / WOJTEK RADWANSKI (Photo credit should read WOJTEK RADWANSKI/AFP/Getty Images)
MOSCOW, RUSSIA - JUNE 13, 2016: Placards and flowers brought at the US Embassy in Moscow to pay tribute to the Orlando nightclub shooting victims. Alexander Shcherbak/TASS (Photo by Alexander Shcherbak\TASS via Getty Images)
SEOUL, SOUTH KOREA - JUNE 13: Flowers are placed on a rainbow flag to remember victims of the shooting at an Orlando nightclub on June 13, 2016 in Seoul, South Korea. Omar Mateen, who had recently pledged allegiance to ISIS, died after killing 49 people early morning on June 12 at a gay nightclub in Orlando, Florida. The massacre was the deadliest mass shooting in the United States. (Photo by Chung Sung-Jun/Getty Images)
People hold candles as they share a minute of silence during a vigil for the victims of the Orlando shooting in Florida, in Hong Kong on June 13, 2016. Law enforcement authorities have lowered the death toll from the weekend massacre at a gay nightclub in Orlando to 49, the deadliest mass shooting in American history, explaining that the shooter had been counted in the original tally. / AFP / ANTHONY WALLACE (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)
BANGKOK, THAILAND - JUNE 13: People hold a rainbow flag during a vigil for the attack at the gay club in Orlando, on Monday, June 13, in Bangkok, Thailand. (Photo by Dario Pignatelli/Getty Images)
Australians gather to place candles and flags in Sydney on June 13, 2016, in solidarity with the global gay community after a gunman opened fire in a nightclub in Orlando, Florida, killing over 50 people. The Sydney Harbour Bridge was lit with the colours of the rainbow on June 13 as hundreds of Australians gathered to stand in solidarity with the global gay community after the worst mass shooting in modern US history. / AFP / WILLIAM WEST (Photo credit should read WILLIAM WEST/AFP/Getty Images)
WELLINGTON, NEW ZEALAND - JUNE 13: Members of the public look on during a candlelight vigil for the victims of the Pulse Nightclub shooting in Orlando, Florida, at Frank Kitts Park on June 13, 2016 in Wellington, New Zealand. Omar Mateen allegedly killed more than 50 people and injured 53 others in what is the deadliest mass shootings in the country's history. (Photo by Hagen Hopkins/Getty Images)
Josh Mercer wears a T-shirt Monday, June 13, 2016, in honor of two of his friends who were killed during a fatal shooting at Pulse Orlando nightclub in Orlando, Fla. (AP Photo/Chris O'Meara)
People gather for a candlelight vigil in remembrance for mass shooting victims in Orlando, from San Diego, California, U.S. June 12, 2016. REUTERS/Mike Blake
Mourners gather under a LGBT pride flag flying at half-mast for a candlelight vigil in remembrance for mass shooting victims in Orlando, from San Diego, California, U.S. June 12, 2016. REUTERS/Mike Blake
A rainbow flag is held up during a vigil after the worst mass shooting in U.S. history at a gay nightclub in Orlando, Florida, in front of the White House in Washington, U.S., June 12, 2016. REUTERS/Joshua Roberts
Men stand together during a vigil after the worst mass shooting in U.S. history at a gay nightclub in Orlando, Florida, in front of the White House in Washington, U.S., June 12, 2016. REUTERS/Joshua Roberts
People hold a vigil after the worst mass shooting in U.S. history at a gay nightclub in Orlando, Florida, in front of the White House in Washington, U.S., June 12, 2016. REUTERS/Joshua Roberts
A rainbow flag is held up with the name of the gay nightclub where the worst mass shooting in U.S. history occured in Orlando,Florida, during a vigil in front of the White House in Washington, U.S., June 12, 2016. REUTERS/Joshua Roberts
Los Angeles County Sheriff's deputies are seen behind a girl riding in a bus at the 46th annual Los Angeles Gay Pride Parade in West Hollywood, California, after a gunman opened fire at a gay nightclub in Orlando, Florida U.S. June 12, 2016. REUTERS/David McNew
People pay their respects to the Orlando massacre victims during a vigil in the Queens borough of New York, U.S., June 12, 2016. REUTERS/Shannon Stapleton
Two women hold each other at a vigil outside The Stonewall Inn on Christopher Street, considered by some as the center of New York State's gay rights movement, following the shooting massacre at Orlando's Pulse nightclub, in the Manhattan borough of New York, U.S., June 12, 2016. REUTERS/Mark Kauzlarich
A man carries a gay pride flag at a vigil outside The Stonewall Inn on Christopher Street, considered by some as the center of New York State's gay rights movement, following the shooting massacre at Orlando's Pulse nightclub, in the Manhattan borough of New York, U.S., June 12, 2016. REUTERS/Mark Kauzlarich
A man lays flowers at a memorial outside The Stonewall Inn on Christopher Street, considered by some as the center of New York State's gay rights movement, following the shooting massacre at Orlando's Pulse nightclub, in the Manhattan borough of New York, U.S., June 12, 2016. REUTERS/Mark Kauzlarich
People take part in a vigil for the victims of a mass shooting at a gay nightclub in Orlando, Florida, U.S., in Sao Paulo, Brazil, June 12, 2016. REUTERS/Nacho Doce
Orlando residents Arissa Suarez (L) and Malcom Crawson attend a vigil at Lake Eola Park for victims of a mass shooting at a gay nightclub in Orlando, Florida, U.S June 12, 2016. REUTERS/Steve Nesius
A Boston Police Officer stands behind flowers left at a Pride Month block party, the same day as the mass shooting at Orlando's Pulse nightclub, in Boston, Massachusetts, U.S. June 12, 2016. REUTERS/Brian Snyder
People attend a candlelight vigil for the victims of the Orlando attack against a gay night club, held in San Francisco, California, U.S. June 12, 2016. REUTERS/Beck Diefenbach
People march down Market Street during a candlelight vigil for the victims of the Orlando attack against a gay night club, held in San Francisco, California, U.S. June 12, 2016. REUTERS/Beck Diefenbach
People hold up signs in solidarity at a candlelight vigil in remembrance for mass shooting victims in Orlando, from San Diego, California, U.S. June 12, 2016. REUTERS/Mike Blake
A candlelight vigil in remembrance for mass shooting victims in Orlando is held in San Diego, California, U.S. June 12, 2016. REUTERS/Mike Blake
A rainbow flag is held up during a vigil after the worst mass shooting in U.S. history at a gay nightclub in Orlando, Florida, in front of the White House in Washington, U.S., June 12, 2016. REUTERS/Joshua Roberts TPX IMAGES OF THE DAY
A couple puts their arms around each other outside the White House where the U.S. flag flies at half-staff at sundown as people gather for a vigil on Pennsylvania Avenue later in the day of the worst mass shooting in U.S. history at a gay nightclub in Orlando, Florida in Washington June 12, 2016. REUTERS/James Lawler Duggan
WELLINGTON, NEW ZEALAND - JUNE 13: The Michael Fowler Centre is lit up in the colours of the rainbow flag after a candlelight vigil for the victims of the Pulse Nightclub shooting in Orlando, Florida, at Frank Kitts Park on June 13, 2016 in Wellington, New Zealand. Omar Mateen allegedly killed more than 50 people and injured 53 others in what is the deadliest mass shootings in the country's history. (Photo by Hagen Hopkins/Getty Images)
ORLANDO, FL - JUNE 12: Candles sit on the edge of Lake Eola, June 12, 2016 in Orlando, Florida. The shooting at Pulse Nightclub, which killed 50 people and injured 53, is the worst mass-shooting event in American history. (Photo by Drew Angerer/Getty Images)
Brett Morian, from Daytona Beach, hugs an attendee during the candlelight vigil at Ember in Orlando, Fla., on Sunday, June 12, 2016. (Joshua Lim/Orlando Sentinel/TNS via Getty Images)
People sit by the water with candles during a vigil in a park following a mass shooting at the Pulse gay nightclub in Orlando, Florida, U.S. June 12, 2016. REUTERS/Carlo Allegri
Flags fly at half-staff around the Washington Monument at daybreak in Washington with the US Capitol in the background Monday, June 13, 2016. President Barack Obama ordered flags lowered to half-staff to honor the victims of the Orlando nightclub shootings. (AP Photo/J. David Ake.)
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Florida Gov. Rick Scott confirmed he had asked President Barack Obama to declare a state of emergency in wake of the shooting.

"Right now it's time to grieve," he told a press conference.

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