Manchester concert bombing

The concert, which included performances from Ariana Grande, Katy Perry, Liam Gallagher, Justin Bieber and others, was the most-watched program of the year in Britain.

U.K. authorities are still trying to find the distinctive blue suitcase Salman Abedi was seen carrying as he moved around Manchester's city center.

Authorities have identified the suicide bomber as Salman Abedi, 22, a British national whose father comes from Libya. Police say Abedi received help with Monday's attack on an Ariana Grande concert.

An attack like this scares women into submission, says ElsaMarie D'Silva, who works to stop street harassment in India.

Salman Abedi's relatives have been detained in Tripoli. In Britain, police arrested a total of seven people. "I think it's very clear that this is a network," the city's police chief says.

Hours before the vigil, British Prime Minister Theresa May announced that another attack could be "imminent." From around the world, people expressed condolences for the bombing victims.

The post-concert bombing is the 13th terrorist attack in Western Europe in a little over two years. This coincides with the rise of the Islamic State, which has been linked to most all the attacks.

Greater Manchester Police believe Salman Abedi, 22, was the suicide bomber and report making at least one related arrest. ISIS claimed responsibility for the attack that killed at least 22.

Police say nearly 60 people have been injured in what is being treated as a terrorist incident. Witnesses reported frantic efforts by concertgoers to flee after the blast at an Ariana Grande show.