PORT-AU-PRINCE, Haiti — Some 50 suspected gang members have died this week after attacking a coastal town in Haiti, including at least a dozen who drowned after their boat capsized, a government official said Thursday.

While the majority were killed by police, a group of gunmen drowned on Wednesday after their boat hit the reef as they ferried ammunition to gangs attacking the town of Arcahaie, said Wilner Rene from Haiti’s Civil Protection Agency.

He told Radio Caraibes that the attack began on Monday, with gunmen burning homes and cars in the town located just northwest of the capital of Port-au-Prince.

When the gangs ran out of ammunition, they hid in nearby areas and were ferreted out by residents and police, he said.

The attack is still ongoing, and Rene warned that officers on the scene urgently need reinforcements from soldiers and special police units.

The attack is blamed on a gang coalition called Viv Ansanm, which also has targeted communities in Port-au-Prince in recent days.

The spike in gang violence comes just months after a U.N.-backed mission led by Kenyan police began with the aim of quelling a surge in violence from gangs, who control more than 80% of Port-au-Prince. More than 700,000 people have been left homeless, thousands have been killed, and the country’s main airport was forced to close for nearly three months earlier this year because of the violence.

The U.S. government and top Haitian officials have warned that the Kenyan-led mission lacks personnel and funding and have asked that it be replaced with a U.N.-peacekeeping mission.

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