London, July 26Daniel Radcliffe was stopped by US guards while crossing over the border from Canada to the US because he failed to upgrade his visa. The ‘ Harry Potter‘ star had been in Toronto to attend the premiere of ‘What If’ with co-star Zoe Karan plus to celebrate his 25th birthday and he was also in the process of upgrading his P-2 visa, for foreign actors and entertainers, to an O-1 visa for the individual who possesses extraordinary ability in the sciences, arts, education, business or athletics, the Daily Express reported.

An O-1 grants the holder a three-year stay in the US, while the P-2 only gives a performer residency for the time they would be working on a project, not to exceed a year. Radcliffe was on his way to attend Comic-Con in San Diego to promote another darker film ‘Horns’. A spokesman told the New York Post that Radcliffe had been approved for the upgrade but needed a stamp from the US embassy in Toronto and their computer was down, which caused the problem.

The 25-year-old actor did eventually get to San Diego, just in time to appear on a Comic-Con panel with Horns co-star Juno Temple and director Alexandre Aja.