British Prime Minister David Cameron said Larry the Downing Street cat has begun performing his duties as his office's official mouser.

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Cameron said Larry has successfully killed a few mice at 10 Downing Street but has yet to nab any of the large rats he was brought in to catch, the Daily Mail reported Friday.

"I'm a big Larry fan," Cameron said on ITV1's "This Morning."

"We have got big mouse infestation in Downing Street and Larry has caught some mice," he said.

"I actually took a picture of one in my flat on my mobile phone, because it was looking at me."