The Countdown co-presenter Rachel Riley has revealed she is to be given extra security on the Channel 4 game show after being abused online for her criticism of antisemitism in the Labour party.

Riley, who is Jewish, said she had been targeted by Labour supporters on Twitter for her criticisms of the party and its leader, Jeremy Corbyn.

She has already spoken about being trolled online, but said the problem had worsened and included physical threats.

She told the Times newspaper: “The more I speak, the more abuse I get, and the more abuse I get, the more I speak. It’s got to the point where I can’t look at my Twitter feed any more … it’s just a constant stream.”

She added: “We are getting more security for Countdown.”

Riley, who has appeared on the programme since 2009, said she believed she was a target for speaking out against antisemitism, and that she did not “take it lightly”.

“With the hashtag #GetTheToriesOut or the red rose or hashtag #JC4PM, they say to me: ‘You’re only calling out the left’. Well, I’ve been attacked by people on the left and the best way to not have me talk about antisemitism on the left is not to be antisemitic.”

Riley has previously stated that she has no political allegiance and is not a Conservative, although she claims she has been labelled a Tory by supporters of Corbyn.

However, she told the Times she would not vote for Labour now, as she believed the party was “actively encouraging the abuse of people who are standing up to this”.

Earlier this week, Riley recalled receiving abusive messages for speaking out about antisemitism at the Holocaust Memorial Day reception at the House of Commons.

Corbyn has strongly denied allegations of antisemitism within Labour.