21.   Bomb experts from the nearby cities of Ilesha and Ilorin joined local police to investigate the blast, Ife Police Inspector Sunday Agehedo said in a telephone interview.

22.   Biloblotskiy Sunday was appointed to head a special commission to investigate the blast.

23.   But an Interior Ministry spokesman said no traces of a bomb were immediately found by police officers investigating the blast.

24.   But Prime Minister Viktor Chernomyrdin, who is heading the commission investigating the blast, said other possibilities were still being considered.

25.   He said police were investigating the blast, the fourth in Riyadh since November.

26.   However, a police official investigating the blast said on condition of anonymity that the explosion was triggered by a timing device.

27.   In remarks published Saturday in the Saudi-owned daily al-Hayat, Sultan said that Saudi authorities were still investigating the blast.

28.   It was not immediately possible to obtain comment from the police or FBI agents in Nairobi investigating the blast.

29.   No one claimed responsibility, and the blasts are being investigated.

30.   President Ali Abdullah Saleh on Friday ordered his security staff to quickly investigate the blast, though Dudley indicated the Americans are conducting their own probe.