Sydney Opera House cancels shows

Performances at Sydney's Opera House have been cancelled following a dramatic siege in the city's centre.

The Australian Ballet's The Nutcracker, The Sydney Theatre Company's Switzerland and Damon Albarn's show in the Concert Hall won't go ahead Monday evening.

"This is to minimise pressure on transport networks," an Opera House spokeswoman said.

Albarn will play two shows on Tuesday evening and the Opera House says people should check websites for information on refunds or exchanges.