Israel has received intelligence warning of plans by Osama bin Laden's al Qaeda network to attack Jews and Israelis in Prague.
Israel named al Qaeda as the prime suspect in a suicide bombing at a hotel in Kenya last month that killed 13 Kenyans and three Israelis and a failed attempt to shoot down with missiles an Israeli airliner taking off nearby.
"A specific warning was received recently about plans to attack Jews and Israelis in Prague," an Israeli security source said, without giving details.
The capital of the Czech Republic is a popular destination for Israelis. Its centuries-old Jewish quarter attracts hundreds of thousands of visitors and Jewish pilgrims each year.
The source said Israel has received information from several foreign intelligence agencies warning of al Qaeda plans to target Israelis overseas.
Following the Mombasa attacks, Israel's Foreign Ministry issued travel advisories warning of potential danger to Israelis in Ethiopia, Eritrea, South Africa, Kenya and certain areas of Thailand.