Anti-migrant activist Daniel Thomas has been arrested over a video appearing to show him slashing at a boat in the English Channel with a knife.

Hampshire and Isle of Wight Constabulary said a 37-year-old man of no fixed abode had been arrested after a “boat that had an emergency responder on board” was damaged in the Channel.

He was arrested on suspicion of criminal damage with intent to endanger life and endangering the safety of a ship on Wednesday. He remains in custody.

The force previously said it was looking at the video which Thomas, known to his supporters as Danny Tommo, had live-streamed on social media on Tuesday.

A French coastguard official was on board when Thomas appeared to slash at it. Some 50 migrants who had travelled in the boat from Normandy had already been taken to Dover for processing.

Far-right activist Tommy Robinson shared a video of Thomas’s arrest on social media late on Wednesday, claiming it was in relation to an attempt to “stop the invasion of our country”.

Thomas organised anti-migrant protests in Dover and Portsmouth in early September which saw roads blocked by hundreds of demonstrators, including groups of men in black balaclavas.

He has been rallying support for “mass resistance” to “take our country back” through his venture Patriot Platform, which he founded earlier this year.