Seven more youngsters aged 15 to 21 have been arrested in connection with the recent attack on a gay man in Dordrecht who had made a date through the gay dating site Grindr, news website Nu.nl said on Tuesday.

Six of the seven come from Dordrecht and the seventh, who is 17, comes from Harreveld. In total, 13 youths have now been arrested as part of the investigation.

Detectives say they have now rounded up everyone they think is responsible for the attack on one man and attempted attack on a second. Both men had made dates via the website.

All 13 youths currently being held in custody but four will be released on Thursday, the public prosecution department said.