Parliament has been hit by a cyber attack, officials at Westminster say.
The “sustained” hack began on Friday night, prompting officials to disable remote access to the emails of MPs, peers and their staff as a safeguard.
The parliamentary authorities said hackers had mounted a “determined attack” on all user accounts “in an attempt to identify weak passwords”.
Government sources say it appeared the attack has been contained but it will “remain vigilant”.
A parliamentary spokeswoman said they were investigating the attack and liaising with the National Cyber Security Centre. She said: “We have discovered unauthorised attempts to access accounts of parliamentary networks users…
“Parliament has robust measures in place to protect all of our accounts and systems, and we are taking the necessary steps to protect and secure our network.
As a precaution we have temporarily restricted remote access to the network.