Acting on a tip off, the police carried out searches in vehicles at the bridge and seized 534 cartridges, besides three magazines of AK-47 rifle from a motorcycle, Senior Superintendent of Police (SSP) Manu Maharaj said.
Sanjay Kumar, a native of Betauda locality under Beur police station area, was arrested in this connection and his motorbike was also seized, he said.
However, two other persons travelling on the bike managed to escape, Maharaj said.