Iran has said Israeli accusations that it was behind the suicide bomb attack on an airport bus in Bulgaria are "unfounded."
The Iranian Embassy in Sofia issued the denial.
Eight people, including the bomber, were killed in yesterday's blast on a bus carrying Israeli tourists in Burgas Airport.
The attack drew a promise by Israeli Prime Minister Benjamin Netanyahu to "react powerfully" to what he called "Iranian terror."
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A total of 310 people are now known to have died in the attacks.
Mike Brown has been told to consider resigning following an inquiry by the London Assembly.
Rescuers are still searching for survivors.