Iran informed Turkey in advance of its planned operation against Israel, a Turkish diplomatic source told Reuters on Sunday, adding that Washington had conveyed to Tehran via Ankara that any action it took had to be "within certain limits."

Turkey, which has denounced Israel for its campaign on Gaza, said earlier on Sunday that it did not want a further escalation of tensions in the region.

The Turkish source, speaking on condition of anonymity, said Turkish Foreign Minister Hakan Fidan had spoken to both his US and Iranian counterparts in the past week to discuss the planned Iranian operation, adding Ankara had been made aware of possible developments.