Hyderabad, Feb 1 (Agencies):  A case against a dozen prisoners was booked at Kushaiguda police station under Cyberabad police commissionerate on Tuesday for allegedly attacking prisoner officials on Monday.

The captives belonged to Cherlapally Central Jail and the complaint was lodged by jail officials. On police baton charging the attackers, two political parties have alleged it was an 'assault on Muslim prisoners'. Six officials were injured in the attack by prisoners on Monday evening.

Deputy Superintendent of jail Hanumantha Rao and another official, Srinivasa Reddy, sustained grave injuries and were shifted to Nizam's Institute of Medical Sciences.

The clash between the prisoners and the jail staff sparked tension with leaders of Muslim political parties Majlis-e-Ittehadul Muslimeen (MIM) and Majlis Bachao Tehreek (MBT) assembling outside the jail to protest what they called the 'assault on Muslim prisoners'.

The leaders, including two legislators of MIM, said that nine prisoners were injured in the attack by jail staff and three are critical.

The leaders, including MBT corporator Amjadullah Khan Khalid, accompanied by parents and relatives of the prisoners, protested and demanded action against the jail staff. They claimed that new jail superintendent K.L. Srinivasa Rao, who took charge Saturday, ordered the assault to establish his domination.

Cyberabad Police Commissioner Tirumala Rao denied that any prisoner died in the clash. He said the situation in the jail is back to normal.

The clash broke out when jail officials were checking the cells and frisking prisoners for mobile phones and drugs. The jail officials alleged that the under trials having alleged links with Pakistan's Inter-Services Intelligence (ISI) attacked them with stones and a cricket bat.

Following the clash, the jail staff moved back but later entered the cell with policemen and resorted to a baton charge to bring the situation under control.