11.   A police commando unit concluded the grenades were Yugoslav-made.

12.   Al-Zawra said the grenade was in a parcel given to a child outside the school by an unidentified driver as a present to the headmaster.

13.   Apart from three grenade blasts, police said three grenades were found unexploded.

14.   Authorities had decided the hand grenade was fake.

15.   But it remained unclear whether the grenades were also part of the drill, and one official denied that the bomb was a drill.

16.   Damages were minimal because the grenade was old and not powerful, Rifai said.

17.   He said that the grenade was the same, Hungarian army-issue type as used in several explosions in Budapest over the past few weeks.

18.   It was not yet clear whether the hand grenade was live, police added.

19.   It was not yet clear whether the hand grenade was live, said police spokesman Frank Maerki.

20.   Maj. Ernesto Maningo, the local army spokesman, said the grenade was an old model known to be used by the guerrillas.