Chilling surveillance photos show Manchester bomber at shopping mall days before attack

Chilling surveillance photos have surfaced showing the Manchester Arena suicide bomber shopping at an area mall just three days before Monday night's deadly terrorist attack.

Salman Abedi, the 22-year-old Islamic extremist who killed at least 22 people including children at an Ariana Grande concert, can be seen in the newly released images carrying the Karrimor backpack that was found in pieces at the scene of the bombing.

Photos show supplies used by Manchester arena attacker:

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Photos show supplies used by Manchester arena attacker
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Photos show supplies used by Manchester arena attacker

Backpack

The location where officials found the bomber's torso suggests he carried the bomb in his backpack and was propelled across the foyer, according to the Times, citing an explosive disposal technician.

Shrapnel

Authorities found nuts and screws that had been packed inside the bomb. According to the Times, some of the shrapnel penetrated metal doors and left deep marks in the floor. 

Attackers often use these items in homemade bombs to increase the amount of damage inflicted. Media reports stated that doctors and bystanders helped remove nails, nuts, and bolts from the bodies of survivors of the bombing.

Detonator

This detonator was found in the attacker's left hand. According to the Times, it's possible the device could have been operated remotely as well, suggesting the bomber could have multiple ways to detonate the bomb.

Battery

Officials found a "mangled Yuasa 12-volt, 2.1 amp lead acid battery" at the scene, the Times reported, adding that such a battery can be commonly bought for $20. The battery is more powerful than those typically found in suicide bombs, according to the Times.

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Since the deadly attack, police have announced seven arrests in connection to the case, including many of the bomber's family members.

Abedi's younger brother, Hashem, was arrested on Wednesday in Tripoli, Libya, on suspicion of ties to the Islamic State, according to a spokesman for a local counter-terrorism force.

Authorities also said he was suspected of plotting an attack in the Libyan capital.

Ramadan Abedi, father of Salman and Hashem and outspoken supporter of al-Qaida, was also detained outside his home in Tripoli on Wednesday.

Ramadan told a Tripoli counterterrorism force that he did not expect the attack, and that when Salman left home he told his family he was going on pilgrimage to Mecca.

"I spoke to him about five days ago ... there was nothing wrong, everything was normal," he said in an interview.

Salman Abedi and Hashem, both of whom were British-born, flew from their home in Manchester to Libya on April 17.

Salman returned alone exactly on month later on May 17 to carry out the attack after a brief stopover in Dusseldorf, Germany, a hotbed of Islamic extremism.

SEE: Queen Elizabeth II visits Manchester victims:

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Queen Elizabeth II visits Manchester victims
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Queen Elizabeth II visits Manchester victims
Britain's Queen Elizabeth speaks to Millie Robson, 15, from Co Durham, and her mother, Marie, during a visit to the Royal Manchester Children's Hospital in Manchester, Britain May 25, 2017. REUTERS/Peter Byrne/Pool
MANCHESTER, ENGLAND - MAY 25: Queen Elizabeth II shakes hands with a nurse during a visit to the Royal Manchester Children's Hospital on May 25, 2017 in Manchester, England. Queen Elizabeth visited the hospital to meet victims of the Manchester Arena terror attack and to thank members of staff who treated them. (Photo by Peter Byrne/WPA Pool/Getty Images)
Britain's Queen Elizabeth speaks to Evie Mills, 14, from Harrogate, her mother, Karen and dad, Craig during a visit to the Royal Manchester Children's Hospital in Manchester, Britain May 25, 2017. REUTERS/Peter Byrne/Pool
Britain's Queen Elizabeth speaks to Amy Barlow, 12, from Rawtenstall, Lancashire, and her mother, Kathy during a visit to the Royal Manchester Children's Hospital in Manchester, Britain May 25, 2017. REUTERS/Peter Byrne/Pool
Britain's Queen Elizabeth speaks to staff during a visit to the Royal Manchester Children's Hospital in Manchester, Britain May 25, 2017. REUTERS/Peter Byrne/Pool
Britain's Queen Elizabeth speaks to Ruth Murrell who was injured, along with her daughter Emily, 12, in the Manchester Arena attack, during a visit to the Royal Manchester Children's Hospital in Manchester, Britain May 25, 2017. REUTERS/Peter Byrne/Pool
Britain's Queen Elizabeth speaks to staff during a visit to the Royal Manchester Children's Hospital in Manchester, Britain May 25, 2017. REUTERS/Peter Byrne/Pool
MANCHESTER, ENGLAND - MAY 25: Millie Robson, 15, from Co Durham wearing an Arianna Grande t-shirt, a victim of Manchester Arena bombing with her dad, David as Queen Elizabeth II visits the Royal Manchester Children's Hospital to meet victims of the terror attack on May 25, 2017 in Manchester, England. Queen Elizabeth visited the hospital to meet victims of the Manchester Arena terror attack and to thank members of staff who treated them. (Photo by Peter Byrne/WPA Pool/Getty Images)
MANCHESTER, ENGLAND - MAY 25: Queen Elizabeth II escorted by Kathy Cowell (R) Chairman of the Central Manchester University Hospital, during a visit to the Royal Manchester Children's Hospital on May 25, 2017 in Manchester, England. Queen Elizabeth visited the hospital to meet victims of the Manchester Arena terror attack and to thank members of staff who treated them. (Photo by Peter Byrne/WPA Pool/Getty Images)
MANCHESTER, ENGLAND - MAY 25: Queen Elizabeth II speaks to Evie Mills, 14, from Harrogate, her mother, Karen and dad, Craig, during a visit to the Royal Manchester Children's Hospital to meet victims of the terror attac on May 25, 2017 in Manchester, England. Queen Elizabeth visited the hospital to meet victims of the Manchester Arena terror attack and to thank members of staff who treated them. (Photo by Peter Byrne/WPA Pool/Getty Images)
MANCHESTER, ENGLAND - MAY 25: Queen Elizabeth II visits the Royal Manchester Children's Hospital to meet victims of the terror attack in the city earlier this week and to thank members of staff who treated them on May 25, 2017 in Manchester, England. Queen Elizabeth visited the hospital to meet victims of the Manchester Arena terror attack and to thank members of staff who treated them. (Photo by Peter Byrne/WPA Pool/Getty Images)
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