Israel's counterterrorism bureau says Iran and its ally, the Lebanese Shi'ite movement Hizballah are plotting attacks against Israelis and Jews worldwide.
The warning follows a series of recent attacks and attempted attacks against Israeli diplomats in India, Georgia and Thailand.
In a statement, the bureau warned Israelis abroad to be vigilant and to pay attention to local security guidelines.
A blast caused by an explosive device attached to an Israeli embassy car in New Dehli, injured a diplomat's wife on February 13.
Two attempted bombing attacks targeted Israeli diplomats this week in Georgia and Thailand.
Israel blames Iran and Hizballah for the incidents.
Iran and Hizballah have denied any involvement.
Compiled from agency reports