Rotterdam police have raided a transport company which they suspect is involved in  smuggling cocaine. Two men, aged 28 and 36, have been arrested but their identities have not been made public, Dutch media said on Tuesday.

In total, raids were carried out at seven different locations belonging Rotterdam, Vlaardingen and Rhoon, police said. Eleven lorries belonging to the company, AFE Transport, were confiscated.

The investigation began last September following the arrest of an English man on drugs charges. He is though to have had contact with the Dutch suspects, news agency ANP said.

In April, police raided company offices in The Hague in connection with the investigation, where they found 500 kilos of cocaine being found in double-bottomed trailer. Nine people were arrested at that time. The drugs, said to have a street value of €16m, were thought to come from Britain.

Tuesday’s raids involved a team of 80 police officers assisted by soldiers who are specialised in finding hidden spaces.

According to the Telegraaf, the company AFE Transport hit the headlines earlier when it emerged it was using Bulgarian shell companies to employ Bulgarian drivers at below Dutch rates.