Militants on Tuesday carried out two grenade attacks on security force installations in the city in a span of about five minutes, injuring three Central Reserve Police Force personnel.

A senior police official told rediff.com, "Militants tossed a hand grenade inside a CRPF camp in Budshah Chowk which exploded, injuring three troopers. They were rushed to the hospital for treatment."

Militants also shot at and critically injured a police constable in south Kashmir's Anantnag town late on Tuesday afternoon.  The constable was evacuated to Srinagar for treatment.

With inputs from PTI

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The area has been surrounded by security forces and local shopkeepers have downed their shutters in panic.

Minutes later, another grenade was thrown by militants at a police post in Batmaloo, less than a kilometre away from site of the first blast.

"The grenade hurled at a police camp in Batmallo did not cause any damage," the police officer said.

The Jammu and Kashmir police and CRPF personnel have cordoned off both the scenes of blast and so far detained one suspect for questioning.

The twin grenade attacks in the summer capital, which sparked panic, comes at a time when the state government plans to revoke the Armed Forces Special Powers Act from parts of the state.

The police has launched a manhunt to nab the militants and presence of security personnel around the city has been strengthened.

Militants also made an attempt to target policemen in Shopian district of south Kashmir on Tuesday afternoon.Unidentified militants threw a grenade at police personnel, who were on guard duty outside a bank, in Zainapora area, 55 km from Srinagar, at around 2 35 pm, official sources said.

No one was hurt as the grenade did not explode. A bomb disposal squad neutralised the grenade, the sources said adding the area had been cordoned off and a hunt launched to nab the militants.

No militant outfit has claimed responsibility for the grenade attacks which come nearly a fortnight after gunmen shot dead a policeman outside Hazratbal shrine on the outskirts of Srinagar.

Constable Sajjad Ahmad was shot in the head by militants while he was on duty on October 14. He succumbed to injuries a day later. Earlier on September 28, militants killed a policeman at crowded Batmaloo bus stand in the city.