Parliament has been hit by a cyber attack that has left MPs unable to access their emails if not in Westminster.

MPs were alerted to the hack on Friday night and have reported problems getting into their email accounts on Saturday. The attack comes just days after reports that passwords of ministers were being flogged online after hacking groups managed to gain access.

The parliamentary authorities are working with the National Cyber Security Centre to protect the network and ascertain the scale of the damage. One MP affected said email accounts were “vulnerable” and warned that officials were always “one or two steps behind the hackers”.