Die-hard U2 fans staked out the Samuel Beckett Bridge yesterday amid speculation that the chart-topping band were filming a music video for their new album.
The rumour mill was sparked after Dublin City Council closed off the busy city-centre bridge for the entire day to allow for filming - a day when the city's streets were already packed with the Irish Rail strike.
A spokesperson for the council said he didn't know what was being filmed at the site - and it wasn't unusual to close off the bridge on a Sunday for maintenance work.
However, social networking site Twitter was ablaze with rumours that it could be the famous foursome shooting scenes for their eagerly-awaited new album.
Eight articulated lorries were parked beside the bridge for the shoot, along with a van bearing the logo 'Panalux', a top lighting company for the entertainment industry.
There was also a crane parked on Custom House Quay from a company called Musco, which specialises in outdoor lighting.
Groups of ardent U2 fans waited patiently in the driving rain on either sides of the bridge, which stayed closed until midnight, hoping for a glimpse of their idols.
One of the fans said they had seen the reports on Twitter that it could be U2 filming a music video and they had been waiting there all day.
Yet they were left bitterly disappointed. Security staff erected a huge white tent in the middle of the bridge and also put up black sheets of plastic around the railings.
There were no confirmed sightings of any members of the band.
Security staff at the bridge were giving nothing away either. One member of staff told the Herald that the filming was for a Guinness commercial, while another one said they were making a Cadbury's ad.
Earlier this month U2 shot a video in the south of France for one of the songs on their new album.
They chose the Riviera Studio in Nice as the location, having previously used the location for photoshoots for their album How to Dismantle an Atomic Bomb.
The world-famous band have not released a new album since 2009's No Line on the Horizon.
Their new album has been repeatedly delayed, but latest reports say it could now hit the shelves before the end of the year.
They gave fans a taste of what to expect with a single Invisible earlier this year.
A publicist for the band said she "didn't know anything about it" when asked if they had plans to film a music video in Dublin.