A house in Rotterdam was shot at in the early hours of Tuesday morning, the fourth time in a week that the city has been disrupted by gunfire.

Nobody was injured in the latest incident in Nassaustraat, in the Feijenoord district of the port city, police said. Two bullets were recovered from the scene.

A few hours later at least three shots were fired at a house on Hoflaan in Vlaardingen, around 15km from Rotterdam. Police have not ruled out a link between the two shootings.

In the early hours of Sunday morning a car came under fire in Rose-Spoorstraat, near Rotterdam-Zuid station. Half an hour later a house on Vuurplaat was hit by several bullets.

Nobody in the property was injured and the 25-year-old driver of the car was unhamed. Police later arrested two men from Rotterdam aged 22 and 31 in connection with the first shooting.

Officers said the later attack was unconnected and may have been a case of mistaken identity, as the house belonged to an elderly couple.