RAMALLAH, (PIC)-- The PA security forces, answerable to PA President Mahmoud Abbas conducted a campaign of arrests in the northern West Bank city of Tulkarem after their centre came under fire on Thursday morning.

Local sources said that the number people rounded up since the attack on Thursday morning till Friday morning has reached 120, mostly affiliated with Fatah based on internal differences.

PA security men raided shops, cafés and residential blocks. The raid were concentrated on the eastern neighbourhood of Tulkarem, Ezbat al-Jarad and the refugee camp.

On Thursday morning explosive devices went off at the Headquarters of the PA Military Intelligence in the eastern neighbourhood of Tulakarem and the Headquarters was fired on by unknown gunmen, prompting the campaign of raids and arrests which lasted till Friday morning.

The arrests concentrated on people who passed by the building before the incident and concentrated on car drivers as it was suspected that those who fired intensively at the building were travelling in a car.

The function of the PA Military Intelligence is to police other security agencies, but in the past few months this agency has arrested a number of Aqsa Martyrs Brigades activists and transferred a number of them to Jericho and Junaid prisons. The same security agency has arrested tens of Hamas supporters and is notorious for using extreme physical torture to extract confessions.