New Zealander Rob Peihopa has died while in an Australian detention centre.
Rob Peihopa, 42, died on Monday night at the Villawood Immigration Detention Centre.
Staff say he died from a suspected heart attack.
But fellow detainee Vaelua Lagaaia says two Tongans, one Samoan, and one Fijian have been arrested.
He says the Australian Federal Police have locked people out of their rooms to do searches, and as a result four people have been arrested.