More than 100 Kenyan police arrived in Haiti's capital on Thursday to reinforce a security mission whose future has been in limbo, after the U.S. froze some funding before passing a waiver to unlock a separate batch of funds.

The United States is committed to working with the Kenya-led multinational security support mission in Haiti, but its numbers need increase to restore peace and stability to the country, U.S. Secretary of State Marco Rubio said Thursday.

More than 600 Kenyan officers had already been stationed in Haiti as part of a multinational force of police officers and soldiers from other countries — including Jamaica, Guatemala and El Salvador — who assist Haiti’s police in fighting the violent gangs in control of much of the capital, Port-au-Prince.