Iran-backed Shi’ite armed groups in Iraq have ramped up rocket and missile attacks on Israel in recent weeks, raising concerns in Washington and among some Iranian allies of potential Israeli retaliation and regional escalation should they draw blood.

Though the attacks, often from hundreds of miles (kms) away, are not seen by western officials and Israeli experts as posing the same level of threat to Israel as point-blank strikes by Hamas and Hezbollah, they have increased in number and sophistication.

At least two have hit their targets and many have had to be shot down by U.S. and Israeli defences, according to U.S officials and public statements by the Israeli military.

New weaponry such as cruise missiles have been regularly used since May and are harder for air defences to destroy.