Two bomb blasts inside India's largest mosque have wounded at least 14 people.
The explosions went off as worshippers were arriving for Friday evening prayers at the Jama Masjid mosque in New Delhi.
Police said the bombs were crude, "low intensity" explosives.
There has been no claim of responsibility.
Initially the mosque was evacuated and barricaded as police specialists searched for more bombs. But within two hours, police allowed the Friday evening prayers to go forward.
Soon after the blasts, local TV channels showed angry worshipers chanting slogans against the local government for alleged lapses in security.
Officials and Muslim leaders appealed for calm, and Home Minister Shivraj Patil vowed to do everything to save the "secular fabric" of India.