-- A double-decker bus was blown up on bridge in front of Parliament in London on Sunday morning, sparking panic from those nearby who were unaware it was done on a movie set.
Some said children in a nearby playground were frightened and "freaked" by the blast.
Others were worried the explosion was a real attack.
One Twitter user said the explosion brought back harrowing memories of the 2005 attack on London's transport system, in which 52 people were killed. A bus was also blown up in central London during that attack.
The Port of London Authority said Lambeth Bridge was closed to the public prior to the stunt, and members of the London Fire Brigade were on standby in case anything went wrong.
The Associated Press contributed to this report.