Several persons have been detained for questioning in connection with the two cars that were found packed with explosives in Surat, Police Commissioner R M S Brar said on Monday.

"We have not found any leads into who was behind the planting of explosives in Surat city, but several people have been detained for questioning," he said.

The contents of Sunday's find have been sent to a forensic science laboratory for testing, Brar said.

The two cars loaded with explosives had number plates from Vadodara city.

"On investigations we have found out that all the number plates are of two-wheelers. They (terrorists) used fake number plates to mislead the police," Brar said.

A live bomb was also defused near a hospital in New Citylight area after some residents informed the police.

Surat continues to be high alert with tight security at all major entry and exit points. All vehicles are being checked thoroughly, Brar said. Panic prevailed in many parts of Surat on Saturday after two cars packed with explosives were recovered. Police ordered closure of all malls, cinema houses and restaurants as precautionary measures.