Universal Studios Singapore has shut down the world's tallest duelling rollercoaster, and a major attraction, because of a technical problem, a mere week after the theme park opened.

The Battlestar Galactica, where two rollercoasters shoot off at the same time and loop around each other, will 'only be opened when we have determined the cause and the solution', a spokeswoman said on Friday.

'The ride may be closed for several days or longer to perform a complete analysis. We understand some guests may be disappointed; however, the safety of our employees and guests remains our top priority,' the park said in a statement.

The glitch at the rollercoaster, the flagship attraction of the new Universal Studios park, was found during daily pre-opening testing on Thursday.

The world's fourth Universal Studios welcomed its first visitors on March 18 with a lavish ceremony aimed at attracting luck, and repeat business, to the Singapore theme park.

The park is part of the $4.4 billion Resorts World at Sentosa, owned by a unit of Malaysia's Genting Group, which also has a casino and six hotels, and plans to lure 60 percent of its visitors from Southeast Asia, China and India.-Reuters