Twitter and Facebook say they are willing to assist with the U.K.’s probe of potential Russian interference in last year's "Brexit" vote for the country to leave the European Union.

The two firms said in letters to the U.K. Parliament that they’ll cooperate with British efforts to investigate foreign influence on their platforms around the time of the referendum.

Facebook explained that it had also been asked by the British Electoral Commission to examine potential Russian influence, and it would respond to the commission by the second week of December.

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“Given that your letter is about the same issue, we will share our response with you,” Facebook policy director Simon Milner wrote.

Twitter gave a less concrete timeline, saying that it would share its findings in the “coming weeks.”

Last month, the British House of Commons culture, media and sport committee sent letters to Facebook CEO Mark Zuckerberg and Twitter CEO Jack Dorsey, asking for details into how Russian actors might have tried to influence British politics.

“The British public have a right to understand the extent and scope of Russia’s disinformation campaign in the United Kingdom," committee chairman and Tory Member of Parliament Damian Collins said on Tuesday, according to BuzzFeed.

Both platforms have become the object of scrutiny for U.S. and British lawmakers eager to find out how Kremlin linked groups used the social media platforms to influence their political processes.