Three blasts rocked Srinagar [Images] on Saturday, including one near the civil secretariat, which left five people injured.

The high security civil secretariat in Srinagar houses the offices of the chief minister, senior ministers and top bureaucrats of Jammu & Kashmir.

The civil secretariat was, however, closed for the weekend holiday.

"Militants lobbed a grenade from a back lane of the civil secretariat, which exploded outside its premises, causing injuries to a paramilitary Central Reserve Police Force trooper on guard duty and four others. The injured were taken to hospital for treatment," a senior police officer said.

Shortly afterwards, there were two more blasts. One blast took place at a paramilitary camp at Botashah Mohalla in downtown Srinagar and another inside a cinema hall in Hawal. Police said no one was injured in these blasts.

There has been a spate of hand grenade explosions after a long lull in the Valley in the past one week. Only on Friday, six civilians were injured in a powerful grenade blast in northern township of Baramulla.

No group has yet claimed responsibility for these blasts.