Special to The New York Times
SAN JOSE, Costa Rica, April 26 - President José Figueres has asked the Cuban Government to withdraw its military attaches here. It also has ordered the expulsion of a group of Cuban exiles who are said to be causing “difficulties.”

The action culminated several days of accusations that followed an apparent attempt by two Cubans to assassinate Capt. Manuel Guerra, owner of a small airline. Captain Guerra had been accused by a Cuban Government spokesman of using his aircraft to ferry arms to Mexico to