A couple of hoax bomb threats, including one at the Akshardham Temple complex, on Friday kept the Delhi police on their toes as they conducted futile searches in several places of the captial.

Extensive searches were carried out at PVR Plaza theatre in the busy Connaught Place market and Akshardham Temple complex in East Delhi after police received anonymous phone calls about bombs being planted at these places.

Bomb disposal squads and sniffer dogs were rushed to both the places after receiving the calls in the wee hours, but no explosive substance was found, police officials said in Delhi, heaving a sigh of relief.

Police also conducted random searches at various places, including bus stations and markets, amid a high alert in the capital following the serial bomb blasts in trains in Mumbai on Tuesday.

Security was tightened at vital installations, places of worship, monuments, markets, railway, bus and Metro stations across Delhi in the wake of the terror attacks in the western metropolis.

Senior police officials on Thursday held a special meeting to review the overall security situation in the capital and to finetune the system put in place to avert a Mumbai-like terror attack in Delhi.