Campaigners have scaled the roof of Prime Minister David Cameron's constituency office to protest about fathers' rights.
Three members of New Fathers 4 Justice climbed onto the roof of the office in Witney, Oxfordshire, dressed as superheroes today.
Roger Crawford, 62, from Meppershall, Bedfordshire, and Jeremy Pogue, 50, from Cefn Hengoed, South Wales, and Archit Ssan 46, from London, carried out the protest, the group said.
Other members of the group - which is not associated with Fathers 4 Justice - were also there giving support.
Thames Valley Police said three members of New Fathers 4 Justice were on the roof of the building holding a banner that read "TW*T" and using a megaphone to shout messages.
A spokesman said two officers were at the scene: "We have got officers there, it doesn't seem to be causing any disruption to the community other than the noise."
The move by the campaign group comes after one of its members confronted Justice Minister Ken Clarke at his home in West Bridgford, Nottingham, at the weekend.
The group said today marks the start of its "CON-DEM(N) CAMERON" campaign, saying it had been angered by the Prime Minister's attack on absent fathers on Father's Day this year.
A spokesman said the group is campaigning to change family law to give fathers equal status to mothers to see their children on separation or divorce.
The group repeated its call made at the weekend, saying: "Dads are lining up to climb roofs again and cause whatever disruption necessary to highlight this injustice."