An explosion on a London subway car during Friday’s morning rush hour sent 22 people to the hospital and is being investigated as a terror attack.

Around 8:20 a.m. local time, an improvised explosive device detonated on a train car at Parsons Green station in west London, according to London’s Metropolitan Police

Photos show a “fireball” engulfing the car and a plastic bucket with burn marks in the subway car, which was part of the District Line, according to CNN.

None of the injuries sustained in the attack are considered life-threatening, according to CNN. 

ABC News reported that a manhunt was underway for a suspect. 

This is the fifth major terror attack in Britain this year, according to the New York Times.

"Suddenly, there was this boom," eyewitness Gustavo Vieira told CNN. "Everyone shouting and screaming... We were just leaving the carriage [when the explosion happened]... Just heard and everyone starting running... And I didn't look back."

The early morning attack is being treated as a terror incident, a British official told ABC News. Hundreds of detectives working on the case, police said at a press conference this morning. 

CNN reported that a timer was found on the IED, which suggested it was meant to cause more damage, according to intelligence sources. 

Another witness, software developer Sylvain Pennec, told CNN: "It was maybe 10 meters from me, the explosion. I didn't fully realize because I had my headphones on. I heard a big... 'Bam.' An explosion noise.”

Read More: Over 35,000 British Muslims Gather in Hampshire to Condemn Terrorism and Promote Peace

“What we’ve seen today is an attempt by evil and cowardly terrorists to kill, to injure, and to disrupt our way of life,” London Mayor Sadiq Khan said in a statement, released this morning on Twitter. “We will not allow terrorists to divide our communities. We will never allow terrorists to succeed.” 

US President Donald Trump also responded to the incident in a series of tweets.

"Another attack in London by a loser terrorist. These are sick and demented people who were in the sights of Scotland Yard. Must be proactive!" he tweeted.

Other world leaders expressed their support for the victims of the attack. 

Read More: These Are the Heroes Who Rushed to Defend London Amid Westminster Attacks

“We reject terrorist attacks in London and express our solidarity with the United Kingdom,” Colombian President Juan Manuel Santos wrote to UK Prime Minister Theresa May on Twitter. “Union is the answer to terror.” 

“We pray for those injured in today's terrorist attack in London and thank the brave first responders,” New York City Mayor Bill de Blasio wrote. “New York City stands with London.” 

The Independent reports that “a manhunt is underway.” Meanwhile, the city remains on “severe” alert. 

Global Citizen will continue to update this article as more information becomes available. 

News

Demand Equity

London Underground Explosion Leaves 22 Injured as Police Investigate Terror Link

By Colleen Curry  and  Phineas Rueckert