London: British police investigating the Manchester suicide bombing evacuated an area in the city on Friday after identifying a car which could be "significant" to their inquiry.

Police are investigating the movements of Salman Abedi before he killed 22 people at a concert by US singer Ariana Grande on May 22, in the deadliest militant attack in Britain for 12 years.

Police said on Friday they had located a white Nissan Micra near the centre of Manchester. They put a cordon around the area in Rusholme, evacuated nearby buildings and asked people to stay away.

Traffic was diverted and witnesses reported seeing police helicopters hovering above the area. The bomb disposal unit were also in attendance, Manchester Evening News reported.

"We are very interested in anything people can tell us about the movements of this car, and who was in it, over the past months," Detective Chief Superintendent Russ Jackson said in a statement. "We are also interested in any information about who may have had access to the car or who may have gone to and from it."

Earlier, police released new CCTV images of the Manchester bomber's last moments, hoping to piece together his final preparations before the concert blast.

The images released on Friday came as Salman Abedi's cousins said they were traumatised by last week's attack at the Manchester Arena, in which 22 people were killed. Isaac and Abz Forjani, who were arrested and released without charge, expressed shock at Abedi's actions.

Isaac Forjani told the BBC it's "not easy" being connected to "22 lost, innocent lives."

He said "the fact that the person that did this is related to us by blood is something that's going to stay with me for the rest of my life."

The developments unfolded after Prince William travelled to Manchester on Friday in a show of support for the city.

The Duke of Cambridge met with first responders and emergency services at Greater Manchester Police headquarters, before signing the book of condolence at Manchester Cathedral.

"Manchester's strength and togetherness is an example to the world. My thoughts are with those affected," William said in a statement released by Kensington Palace.

He later visited some of the injured victims of the attack, who are being treated at Royal Manchester Children's Hospital.

This follows a visit by the Queen last week to the same hospital. During her visit, she described the terror attack as "very wicked" and spoke to children and teenagers affected by the blast.

A benefit concert for the victims of the attack and their families will take place in the city on Sunday. Organised by Ariana Grande, the concert is set to feature stars such as Justin Bieber, Miley Cyrus, Katy Perry, Pharrell Williams and Coldplay.

It was reported that ticket scalpers attempted to profit from the One Love Manchester concert before Ticketmaster said it would cancel re-sold tickets.

AP, Reuters, Fairfax Media