Press TV reports.
The government troops foiled the potential attack on the prison on Saturday.
Earlier, government troops foiled an attack by the insurgents on Aleppo International Airport.
Meanwhile, Syrian military forces have re-established control over a large part of Bab al-Hadid district in Aleppo
The army has launched a mop-up operation against the insurgents in the northwestern city of Aleppo since Wednesday and so far, several districts, including insurgents' stronghold of Salahuddin, have been cleared of the armed groups.
A large number of insurgents have also been killed, injured and arrested in Aleppo since the beginning of the operation.
Fighting, however, continues between the Syrian army and the insurgents in several other areas of Aleppo, including Bustan al-Qasr, Halak, Bab al-Hadid and Darat Azzeh.
Foreign-backed armed groups have been carrying out terrorist attacks in Aleppo since July 20 after they were defeated in the capital, Damascus, and were forced to flee.
Syria has been experiencing unrest since mid-March 2011. Many people, including large numbers of security forces, have been killed in the turmoil.
While the West and the Syrian opposition accuse the government of killing protesters, Damascus blames ‘outlaws, saboteurs and the insurgents’ for the unrest.
Syrian military forces have killed tens of insurgents who were planning to attack a prison in the northwestern city of Aleppo,