EDITOR’S NOTE: This story has been updated with a video of a second eyewitness account confirming the terrorists were “Muslims” shouting “This is for Allah.”

Even as the mainstream media grapples with the cause and motive for the terrorist attacks in London on Saturday night, an eyewitness caller into BBC provides a strong clue.

Pres. Trump has used Twitter to share news report on London incident.

We aren't relaying president's retweet, as the info is unconfirmed.

— NBC Nightly News with Lester Holt (@NBCNightlyNews) June 3, 2017

Three separate but obviously connected terrorist attacks took place, with one being a van that veered into crowds on and around the London Bridge, followed by men from the van getting out of the car and stabbing several people with knives.

At 0025hrs 4/6/17 the incidents at #LondonBridge & #BoroughMarket were declared as terrorist incidents.

— Metropolitan Police (@metpoliceuk) June 3, 2017

As you can see from the video below, an eyewitness caller into BBC said that the terrorists shouted “This is for Allah” as they were “running towards the people.”

Whatever the United States can do to help out in London and the U. K., we will be there – WE ARE WITH YOU. GOD BLESS!

— Donald J. Trump (@realDonaldTrump) June 3, 2017