Story highlights At least seven civilians were killed and 48 others injured, police said

The terror played out at two locations: London Bridge and Borough Market

(CNN) Attackers targeted the heart of London on Saturday night, with a white van plowing into screaming pedestrians on London Bridge, followed by stabbings in bars around Borough Market.

At least seven people were killed and 48 others injured, police said. The three attackers were shot dead by police.

Here's how the incident unfolded:

LONDON BRIDGE

People are led away from the scene near London Bridge.

The van entered London Bridge at 9:58 p.m. (4:58 p.m. ET).

At 10:08 p.m London Metropolitan officers responded to reports of a vehicle hitting pedestrians on London Bridge.

Witness Mark Roberts said he saw a van speed across London Bridge toward the underground station before it suddenly swerved, bounced off the pavement and hit several pedestrians. What sounded like gunfire rang out five to 10 minutes later, he said.

Brad Meyers had just left London Bridge when he heard a "boom" behind him, which he thought was a car hitting the guardrails or other vehicles. He said he saw someone jump into the water in fear.

Multiple ambulances rushed to the scene, with the first team arriving within six minutes, according to the London Ambulance Service.

British Prime Minister Theresa May called the attack a "potential act of terrorism," and plans to chair a government emergency meeting Sunday.

Police said the assailants were wearing what looked like explosive vests, which were later found to be fake.

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