Anonymous threatening calls complicate situation

The extraordinary security measures have also inspired several prank callers, complicating the situation for police. The first serious threat came on Saturday, shortly after the news of the terrorist threat was made public. A bomb threat forced the closure of Prague's metro line 'C', but a police investigation found nothing.

An anonymous bomb threat was also called in to the Marriott hotel in Prague 3 early Sunday morning, forcing the evacuation of 200 hotel guests. Police searched the premises but found no explosives. Police are warning that if the prank callers are identified and found guilty, they face up to five years in jail.