Washington, Feb 1 (Agencies): The US State Department has recently cautioned US citizens across the world on the "continuing threat of terrorist actions" and a second advisory cautioning travel to Britain.

"Current information suggests that Al-Qaeda and affiliated organisations continue to plan terrorist attacks against US interests in multiple regions, including Europe, Asia, Africa, and the Middle East," said the advisory issued on Monday, which updates the last Worldwide Caution post from August 2010.

The State Department warned that militant groups could target parts where US citizens may assemble in large numbers, such as sporting events, hotels, or places of worship.

Attacks could include a variety of tactics "including suicide operations, assassinations, kidnappings, hijackings, and bombings," said the statement.

In the next warning the State Department cautioned US citizens travelling to or living in Britain, due to a "continuing high level of terrorist threat."

The agency also said that targets could not only include subway and rail systems, but may include transport hubs in a number of European cities, citing as an instance, the January 24 Moscow airport bombing, which killed 35 people.