(RNN) - Police responded to what they called an "incident" at London Bridge and soon after reported an incident at Borough Market, a few blocks away.
Several pedestrians were run over by a van in London on Saturday, according to local media reports.
An eyewitness told CNN he saw a van drive down the bridge at a high rate of speed, swerving toward pedestrians.
Reports say more than a dozen people were injured.
#LondonBridge: According to one report 15-20 people were injured, some seriously, after the car ploughed into them https://t.co/pYkiuFVi5F pic.twitter.com/lFqUd7z09y
— The Telegraph (@Telegraph) June 3, 2017
Video from the scene shows people being evacuated
The current London Bridge opened in 1973 and is made of concrete and steel. It replaced a 19th-century stone-arched bridge that was relocated to Lake Havasu, AZ.
England has been under heightened alert since a bomb was detonated at an Ariana Grande concert in Manchester almost two weeks ago.
Grande is scheduled to perform a benefit concert for victims of that bombing Sunday.
In March, a knife-wielding man plowed a car into pedestrians on London's Westminster Bridge and later stabbed a police officer to death inside the gates of Parliament. The assailant and four other people were killed, and 40 others were injured.
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