Nearly two battalions (2,000 personnel) of Central paramilitary force will be required to provide security cover to the Reliance refinery at Jamnagar in Gujarat.

Sources in the Union home ministry said on receiving sanction from the government for proving security to the refinery, a thorough survey of the installation was conducted after which a strength of nearly 2,000 personnel was recommended.

The ministry's clearance came following intelligence inputs suggesting that Pakistan- based terrorists might try to target these installations and launch a surprise attack akin to the one in Mumbai last year.

Sources said the security cover would include crack commandos and Quick Reaction Teams. An Air Defence Mechanism would also be placed, they said.

The Centre has widened the role of CISF from guarding government establishment to providing security to installations in the private sector in the wake of 26/11 attack.

The Jamnagar refinery is close to the Indo-Pak border, which makes it vulnerable to attack from the neighbouring country.