At least 427 Rohingya, Myanmar’s Muslim minority, may have perished at sea in two shipwrecks on May 9 and 10, the United Nations said, in what would be another deadly incident for the persecuted group.

The UN High Commissioner for Refugees(UNHCR) said in a statement on Friday that – if confirmed – the two incidents would be the “deadliest tragedy at sea” involving Rohingya refugees so far this year.