Dubai, Nov 2 (PTI) Saudi police have discovered a huge cache of arms and ammunition including 281 Kalashnikov assault rifles belonging to al-Qaida terror network buried in a vacant house in the Saudi capital Riyadh.

The weapons were found buried in a vacant house under a concrete slab, in Thadeq Governorate, 150 km north of Riyadh, Interior Ministry Spokesman Maj Gen Mansour Al-Turki was quoted as saying by the Saudi Press Agency.

"The security authorities do not make arrests unless they have precise information and evidence indicating involvement in criminal or terrorist activities," he said.

The arms haul comprised 281 Kalashnikov assault rifles, 250 magazines and 35 cases containing 41,250 rounds of ammunition, he said.

The spokesman said police learned about the cache after investigating a group of al-Qaida suspects arrested in August.