Police are investigating after anti-Semitic abuse was sent to MP Joan Ryan.
The former Labour MP has been sent two letters with “malicious communication”, police said.
The politician quit the Labour Party last week, citing concerns over its relationship with the Jewish community.
The Metropolitan Police confirmed that two letters sent to the former Labour Friends of Israel chairman are being investigated.
Ms Ryan, who has now joined the breakaway Independent Group of MPs, said the party had become "infected with the scourge of anti-Semitism" under Jeremy Corbyn's leadership when she quit.
Scotland Yard said: "Police are investigating after two items of malicious communication were sent to a serving MP in February 2019.
"The items, both letters, contained abuse of an anti-Semitic nature.
"A number of enquiries including a review of relevant CCTV footage and forensic analysis are in hand."
No-one has yet been arrested.
Additional reporting by Press Association
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