The blast at Bulgaria's Burgas Airport Wednesday night, in which a number of Israeli tourists are reported to have been killed or wounded, is a terrorist attack, according to the Bulgarian police.

Between 3 and 5 Israeli tourists are reported dead and some 18-20 are reported wounded in the explosion which hit their bus at the Sarafovo Airport near Bulgaria's Black Sea city of Burgas at about 5:30 pm EET.

The Bulgarian authorities have confirmed there are casualties have not confirmed their number.

The site of the Burgas Airport says the Israeli tourists arrived on a flight of Air Via from Tel Aviv at 4:50 pm. After that, they got on a bus to reach Bulgaria's largest Black Sea resort Sunny Beach.

According to reports, there were about 40 Israeli tourists on the bus. A total of three buses caught fire on the Burgas Airport parking lot, a local news site, Burgas 24 says.

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