Haiti has asked for foreign troops to be sent to the country to protect key infrastructure after the assassination of President Jovenel Moïse.
Haitian police earlier said a group of 28 foreign mercenaries killed the president on Wednesday, BBC reported.
After a gun battle in the capital Port-au-Prince, 17 of them were detained.
Some of the group, which Haiti says included retired Colombian soldiers, were held at the house they were using, others after entering Taiwan's diplomatic compound, the police said.
Three suspects were killed by police, and eight others are still being sought.