Five people died and at least 40 others were injured Wednesday after a man rammed into several pedestrians on London’s Westminster Bridge before attacking a police officer stationed outside the British Parliament, police said.

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Mark Rowley, national head of counter-terrorism and policing for London metropolitan police and acting deputy commissioner, said the attacker and a police officer who he stabbed were among those killed.

The Islamic State group claimed through its Aamaq news agency on Thursday that the attacker, who  was identified by police as British-born man Khalid Masood, was “an Islamic State soldier,” according to multiple reports.

Police were called at 2:40 p.m. GMT to respond to reports of a “firearms incident” at the bridge, just down the street from Parliament’s home at the Palace of Westminster, London metropolitan police said.

Here’s what we know so far: