A letter bomb exploded Thursday at the headquarters of ING bank in Amsterdam. - Evert ELZINGA

Fortunately, there were no casualties. A letter bomb exploded on Thursday at the headquarters of ING bank in Amsterdam. Only a bank employee who inhaled smoke was taken care of by the emergency services, police said on Twitter.

Another IED was discovered Thursday morning at the offices of the US software company, Unisys, in Leusden (center), before being defused by the Department of Defense's explosive ordnance disposal units (EOD) ).

"There could be a link" between these incidents

On Wednesday, two letter bombs had already exploded, still without causing any casualties, on the premises of the ABN AMRO bank in Amsterdam and the Japanese office automation group Ricoh in Kerkrade. "There could be a link" between these incidents, reported Dutch public television NOS citing police sources.

The sender of these letters threatened them with other explosive attacks if a certain amount of bitcoin, which was not disclosed, was not paid to him.

Police believe "firmly" that the Wednesday blasts were themselves linked to a series of at least seven letter bombs addressed to various businesses, hotels and gas stations during the months of December and January.

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