Simon Thomas has quit as a Welsh Assembly Member after being arrested by police investigating allegations of possession of indecent images.
The Plaid Cymru Mid and West Wales AM, a 54-year-old married father-of-two, has also quit the party.
Mr Thomas, who was MP for Ceredigion between 2000 and 2005, has deleted his Twitter page and personal website.
Dyfed-Powys Police said an “individual from Aberystwyth” had been released on bail for 28 days.
A statement from the force said an arrest had been made “on suspicion of possessing indecent images”.
The assembly’s Presiding Officer Elin Jones confirmed Mr Thomas’s resignation in a statement at about 10:00 BST on Wednesday, saying “the Llywydd has received a letter of resignation from Simon Thomas with immediate effect”.
Asked if police had searched his office in Cardiff Bay, a spokeswoman for the Assembly Commission, which is…