At least 40 people were killed after gang members attacked displaced persons sheltering inside a church outside Haiti's capital city, Port-au-Prince, the local mayor and the United Nations said Monday.

"We have counted around 40 bodies. Searches are continuing. Some people are still missing," Kenscoff mayor Massillon Jean told the AFP news agency.

Several of those killed on Sunday night had already fled violence earlier this year, Jean said.

"The bandits raided a displaced persons camp located in a church. They executed several people. There are fatalities and dozens of wounded. Some people were abducted by the criminals," Jean said.Many of the victims had already been displaced by gang violenceImage: Patrice Noel/REUTERS

What do we know about the attack near Haiti's capital city?