(Reuters) - Over 2,300 children were separated from their parents at the U.S.-Mexico border between May 5 and June 9 under the Trump administration s zero tolerance policy, U.S. Customs and Border Protection said on Tuesday, and immigration advocates and legal experts say there is no clear system in place to reunite them.

The policy directs border officials to refer for prosecution all immigrants apprehended while crossing the U.S.-Mexico border illegally.