FILE - Police are seen in Rotterdam, Netherlands, Aug. 23, 2017.
FILE - Police are seen in Rotterdam, Netherlands, Aug. 23, 2017.

Dutch police said Thursday that they had arrested seven men suspected of plotting a "major terror attack in the Netherlands." National prosecutors said they believed the alleged plot has been foiled.

The national prosecutor's office said in a statement that the suspects were arrested in the towns of Arnhem and Weert.

The statement said the arrests were the result of a months-long investigation based on intelligence suggesting a 34-year-old man of Iraqi descent was planning an attack on a large event that could cause major casualties.

The suspects allegedly had planned to use bomb vests and assault rifles to attack one site, and a car bomb to attack another. Authorities say they are still investigating potential targets.