British police say they have arrested a man on suspicion of arson with intent to endanger life over a fire at the London house where U.K.

Counter-terrorism police are investigating a fire described as "suspicious" at a house owned by British Prime Minister Keir Starmer early Monday.

A 21-year-old suspect was arrested Tuesday after the private London home of U.K. Prime Minister Keir Starmer was damaged by a "suspicious" fire, reports say.