The mayors of Amsterdam and The Hague have ordered four branches of a money changing bureau to stay closed after they were the target of bomb attacks.

Three offices of Suri-Change in Amsterdam were hit at around 3am last Wednesday morning, one of which was struck again two nights later.

Mayor Femke Halsema decided on Friday to shutter the three branches on Jan Evertstraat, Eerste van Swindelstraat and Bijlmerdreef, though five other offices remain open.

On Saturday night the company’s headquarters in Rotterdam were bombed, prompting the city council to close the premises and two branch offices on the city.

On Tuesday The Hague’s mayor Jan van Zanen, took the decision to close the Suri-Change office on Heemstraat after it was attacked the previous night.

The city council said the premises were being kept shut because of the high risk of further attacks, in view of “the systematic nature of the serious violent incidents and because a criminal investigation is ongoing into Suri-Change Ltd.”

Police suspect that the network of money change offices, which are mainly used by the Surinamese community, are being used to launder millions of euros in profits from cocaine smuggling.

Two months ago police raided the head office in Rotterdam and arrested the 73-year-old owner and his two sons, aged 49 and 45. They also impounded 42 properties with a total value of €25 million.