The football association in Cyprus has postponed all first division matches over the weekend after a bomb damaged the car of a top referee in the country.

Police say an explosive device was placed on the hood of the referee Leontios Trattos' car and it exploded early Friday in a parking lot outside his apartment in a Nicosia suburb. No one was injured but his car and another vehicle nearby were damaged.

The attack comes days before the United States are due to play a friendly against Ukraine in Larnaca on Wednesday. The match was moved from Kharkiv because of violence in Ukraine.

Trattos is the president of the Cyprus referees' association and he has overseen international matches.