No details yet, but the description of the threat as “ related to increased security risks of similar character abroad” seems to suggest it’s another Islamic terror plot: Armed police deploy in Prague after attack warning. (Hat tip: Elphidelphi.)

PRAGUE (Reuters) - Czech police deployed armed guards in Prague’s historic centre on Saturday after security services issued its most serious warning of a terrorist attack.

Prime Minister Mirek Topolanek said the government of the central European nation had met late on Friday and early on Saturday to adopt extra security measures. Police deployed guards around dozens of buildings in the historic capital of 1.2 million, which is a magnet for foreign tourists. Armed police also patrolled central Prague.

“The government received information from representatives of the security services and police of an increased risk of a terrorist act on the territory of the capital, Prague, related to increased security risks of similar character abroad,” Topolanek said in a written statement. “The government … decided to strengthen security measures on the territory of the capital, Prague, with the aim of eliminating the existing risks,” he added.

Interior Minister Ivan Langer said the threat was the most serious for the country of 10 million. “This is the first time that the Czech Republic is facing, in such a concrete way, such a concrete heightened risk of a terrorist act,” Langer told a news conference.