Police say their investigation is progressing following Saturday’s terror attack in London which left seven people dead and nearly 50 others injured.

Investigators have arrested two more people this morning in connection with the attack and according to London police, counterterrorism investigators have searched two homes and detained "a number" of people suspected of some connection to the three London Bridge attackers.

It happened Saturday night when a van veered off the road and barreled into pedestrians on the busy London Bridge. Police and witnesses say the three men then exited the van with large knives and attacked people at bars and restaurants in nearby Borough Market.

The attack unfolded quickly, and police say officers fatally shot all three attackers within eight minutes.

Their identities haven't been released at this time, but ISIS has claimed responsibility for the attack.

British Prime Minister Theresa May is calling for a tougher stance at home against extremists.

"We need to work with allied democratic governments to regulate cyberspace to prevent terrorism planning,” says May. “Need to do everything we can at home to reduce extremism online."

A vigil for the victims is scheduled Monday night near the attack site.

It marks the second terror attack in the United Kingdom in less than two weeks after a suicide bombing killed 22 people and injured more than a hundred others in Manchester.