Clownish red stickers have appeared on the noses of the leaders of Portugal's political parties on large billboards ahead of next month's general election.
The stunt has added a colourful note to the general election
The stickers were first spotted last week, and have spread to posters across Lisbon's main avenues.
The Socialist Party was particularly crimson over a red nose stuck on an image of its leader outside party headquarters, next to a police station.
Police said they would monitor the posters in the run-up to the polls.
No political party has been spared.
Jose Socrates, leader of the main opposition Socialist Party, is standing for prime minister and has a commanding lead in opinion polls ahead of the 20 February election.
The red nose campaign appears to be coordinated and organised. A ladder would be needed to reach most of the party leaders' noses.
Lisbon police said they had no idea who was behind the stunt but were keeping a special watch on the billboards.
Billboards of the Social Democratic Party and the Popular Party also display new red stickers.