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Two people were injured on Wednesday when a grenade exploded inside Bihar's Jehanabad jail.

A jail official and a woman visitor were hurt after the blast, initially thought to have been triggered by Maoist guerrillas. There was panic as jail officials, visitors and inmates ran for cover fearing a Maoist attack.

"But we soon realised that a grenade had exploded accidentally. We will inquire into it," said a jail official.

Dozens of Maoist leaders as well as activists of the banned Ranvir Sena, a private army of landed upper caste-Bhumihar, are lodged in Jehanabad.

The jail hit the headlines last year when armed Maoists attacked the premises and freed hundreds of inmates.