An international relations professor believes the death of Hamas leader Ismail Haniyeh brings considerable risks to Israel.

Hamas has released a statement, saying the 62-year-old was killed in an Israeli 'raid' on his home in Tehran.

Iranian analysts have immediately blamed Israel for the attack, but Israel is yet to officially comment.

Otago University professor Robert Patman, says Haniyeh was one of the top negotiators in the hostage talks in Qatar.

"To take him out sends a signal that perhaps Netanyahu puts the fate of the hostages somewhat below his concerns to annihilate or eradicate Hamas."

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