Bulgarian police authorities have arrested four suspects allegedly responsible for the bomb explosion that nearly killed a man in the Southwestern Bulgarian town of Sandanski on Friday.

Police have detected traces of the same explosives that triggered the blast on the suspects' hands, Bulgarian Interior Minister Tsvetan Tsvetanov told reporters on Sunday.

Tsvetanov reiterated that, even though the bomb went off in front of the office of the Euroroma political party, there were no political motives behind the criminal act.

He hinted that two of the arrested suspects may have been involved in an accident back in April, in which a handmade bomb was thrown in Sandanski's Roma quarter.

On Saturday, Blagoevgrad region police commissioner Georgi Kostov said that local Euroroma head Toni Angelov has expressed fears that the blast might have been ethnically motivated.

The powerful blast went off early Friday morning in front of the Euroroma Sandanski office, critically injuring a 59-year-old Roma man, who was transported for intensive care in Sofia on Saturday.

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