Three Turkish soldiers were injured after a "deliberate" attack by Syrian goverment forces on one of Turkey's observation posts in Idlib province, Ankara said Thursday.

Some 35 mortar were fired by Syrian regime forces from the As Shariah region, which is controlled by Damascus. 

Moscow has announced a ceasefire in Syria's northwestern Idlib province after weeks of intensified rocket fire and air strikes by regime and Russian forces.

"At Russia's initiative, with the mediation of Turkey and Russia, a ceasefire agreement was concluded in the Idlib de-escalation zone as of midnight on June 12," the Russian Reconciliation Centre for Syria said in a statement late Wednesday.

The US Fifth Fleet said on Thursday that its vessels in the Middle East have received distress calls from two tankers reportedly under attack in the Gulf of Oman.

Israeli warplanes bombed bunkers at a Hamas base in Gaza early Thursday following the first rocket fire from the territory since early May, the military said.

Riyadh accused its arch-foe Tehran on Thursday of ordering a Yemeni rebel missile strike which wounded 26 people at a Saudi airport and warned of "grave consequences".

Suspected attacks left two tankers in flames in the waters of the Gulf of Oman Thursday, sending world oil prices soaring as Iran helped rescue stricken crew members.

The mystery incident, the second involving shipping in the strategic sea lane in only a few weeks, came amid spiralling tensions between Tehran and Washington, which has pointed the finger at Iran over earlier tanker attacks in May.

US House of Representatives lawmakers introduced a bipartisan measure Wednesday to block President Donald Trump's weapons sales to Saudi Arabia, after his administration announced it was bypassing Congress to transfer arms to the kingdom and other allies.

The lower chamber's pushback against the White House comes a week after US senators across the political spectrum also moved to prevent the $8.1 billion sale.

An Egyptian military court on Wednesday sentenced nearly 300 people to prison terms, including some who in 2014 attempted to attack President Abdel Fattah al-Sisi, security sources said.

A Saudi princess, sister to powerful Crown Prince Mohammed bin Salman, is to be put on trial in Paris next month over allegations she ordered her bodyguard to beat up a workman in the French capital, a legal source told AFP Wednesday.

Japan's visiting Prime Minister Shinzo Abe called on Iran to play a "constructive role" for peace in the Middle East on Wednesday after meeting with President Hassan Rouhani.