Hundreds of protesters have clashed with police in Portsmouth after a mega-dinghy carrying 140 migrants reached the UK from Normandy, The Telegraph reports Monday.

Around 500 demonstrators are believed to have joined a protest in the area on Sunday night, with some dressed in all black–similar to those who joined an anti-illegal migrant protest which blocked the Port of Dover on Saturday.

The large boat of migrants–believed to be the longest-ever Channel crossing by people-smugglers–was intercepted in the Solent between the Isle of Wight and Portsmouth earlier on Sunday.

Demonstrators blocked the only access road to the marina in Eastney, where it is thought the migrants are being held.

Police used riot shields and pepper spray to force the crowds back, but the line broke through the weight of numbers. Protesters then made their way inside the marina compound.

Authorities estimated that up to 140 people were on board the vessel, 90 short of the record 230 who crossed on a similar boat last month.

"We want to stop them all coming in. We don’t need any more people in Hampshire," said one protester.