Deputy House of Commons Speaker Nigel Evans has been arrested on suspicion of rape and sexual assault, Press Association sources say.
The 55-year-old Conservative MP is being questioned about alleged attacks on two men in their 20s, the sources said.
Police said a 55-year-old man was being interviewed by officers.
The alleged offences took place between July 2009 and March 2013 in Pendleton, Lancashire, police added.
In a statement, a Lancashire Constabulary spokesman said: "A 55-year-old man from Pendleton in Lancashire has today, Saturday, 4th May 2013, been arrested by Lancashire Constabulary on suspicion of rape and sexual assault.
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