Saudi security forces have uncovered a militant hideout filled with bomb-making materials south of the capital Riyadh, the Interior Ministry said on Wednesday.
It said the cache included two tons of fertilizer, ammonium nitrate, aluminium powder, potassium nitrate and other chemicals used by suspected al-Qaida militants to make bombs in their two-year wave of attacks against Saudi Arabia.
Security forces who searched the hideout on Tuesday in Kharj, 40 miles southeast of Riyadh, also found pipe bombs, acid and electrical equipment, the ministry said in astatement.
The statement came hours after the U.S. embassy in Riyadh warned its citizens in Saudi Arabia that militants were planning fresh strikes in the world's biggest oil exporter.
Saudi Arabia has been battling a wave of violence by supporters of Saudi-born Osama bin Laden's al-Qaida network.
The attacks included four bombings of Western residential compounds in 2003, as well as bomb attacks last year at security force buildings and the Interior Ministry in Riyadh.
