People all over the world are offering their thoughts and prayers in the wake of a bombing in Manchester, England that claimed the lives of at least 22 people.

Thousands of people gathered in Albert Square in Manchester to remember the victims who were injured and killed after an Ariana Grande concert. Those who gathered also held a moment of silence for the victims.

In New Jersey, Gov. Chris Christie ordered flags to be lowered to half-staff Wednesday as a sign of mourning. 

Christie called the attack "incredibly disquieting,” and mentioned that his own 13-year-old daughter is a fan of Grande, adding that he could imagine waiting outside a concert for her in a similar situation.

New Jersey residents and people across the world have been trying to find ways to help Manchester while the city deals with the aftermath of the attack.

Manchester officials say that one simple way is to sign the Manchester City Council's book of condolences online.

The Manchester Evening News set up a fundraiser to support the victims’ families and those injured in the attack. In less than two hours, about 1,300 people donated nearly $26,000. The goal is to raise about $1 million.

Officials are also asking people to share photos of those missing after the attack on social media, using the hashtag #MissingManchester. But officials are asking everyone to be cautious about circulating fake pictures online. People are urged to do a little bit of research before sharing or retweeting a photograph or information.

British Prime Minister Theresa May raised the threat level from terrorism to critical, meaning an attack may be imminent. Critical status means armed soldiers may be deployed instead of police at public events such as sports matches.

May says Salman Abadi, the suicide bomber who carried out the attack, may have been part of a bigger network.

British police have raided two sites in the northern English city and arrested a 23-year-old man at a third location. 

The Islamic State group has claimed responsibility for attack, but a top American intelligence official said the claim could not be verified.