1.   But the Bosnian Serbs apparently are unable to lock their radar on NATO planes.

2.   Since December Iraq has been challenging the zones and locking its radars on to allied planes.

3.   The Pentagon said the firing of the missile was standard procedure when Iraq locks its radar on any U.S.-allied aircraft.

4.   The Pentagon said the firing of the missile was standard when Iraq locked its radar on any U.S.-allied aircraft.

5.   The United States considers any attempt by Iraq to lock its radar onto allied planes patrolling the zones to be an act of aggression.

6.   UN officials have expressed serious concern over several incidents of Serb missile systems locking their radar onto aircraft of the North Atlantic Treaty Organisation.

7.   The difference now, Hewlett said, is the practice of locking their radar on to aircraft to track them in flight, technically a hostile act.