Russia and Germany on Thursday urged countries in the Middle East to show restraint and Israel said it was preparing to "meet all its security needs" in a region on edge over an Iranian threat to strike Israel.
The German airline Lufthansa, one of only two Western carriers flying to Tehran, extended a suspension of its flights to the Iranian capital and Russia warned against travel to the Middle East.
Iran has vowed revenge for the April 1 airstrike on its embassy compound in Damascus that killed a top Iranian general and six other Iranian military officers, ratcheting up tension in a region already strained by the Gaza war.
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