Attack was the first by Iranian-backed groups against US troops in Iraq since they halted a campaign in early February.
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Mohammed Hamo is the first Syrian officer to face trial in Europe over military operations in the civil war.
Washington has urged Israel to avoid escalation, but Gaza track record raises doubts US will be heeded, analysts say.
More than 1,000 people have arrived in Cyprus on boats from Lebanon this month amid deepening tensions in Middle East.