The U.K.’s domestic security service warned British lawmakers of new Chinese-backed efforts to target them online, reigniting concerns about espionage by Beijing around Parliament.

MI5 issued an alert on Tuesday identifying two online accounts claiming to represent headhunting groups that it said were run by Chinese intelligence agencies. The accounts were ostensibly recruiting for companies called BP-YR Executive Search and Internship Union.

The security service told Members of Parliament that spies used such cover stories to approach British politicians and officials on networking sites such as LinkedIn, often offering jobs as freelance consultants.