COPENHAGEN, Denmark (AP) — A 57-year-old truck driver was detained Thursday after loads of potatoes were found spilled on a key bridge linking two Danish islands, police have said. The driver was held on suspicion of causing reckless endangerment to life.

A first spill was reported on the westbound side of the Storebaelt bridge at 6.35 a.m. (0435 GMT), police spokesman Kenneth Taanquist said. The bridge connects the island where the capital, Copenhagen, is located to the rest of Denmark.

A similar incident happened on the eastbound side a short time later, Tanquist added.

”It looks weird,” he said. “We are working on two hypotheses: it is either an accident or it is something that has been done deliberately.”

Police said the roads had become slippery and urged drivers to drive slowly. According to the Danish Road Directorate, lines of vehicles were reported on either side of the roughly 18-kilometer (11 .2 miles) bridge and tunnel link between the islands of Funen, where Odense — Denmark’s third largest city — is located, and Zealand, where Copenhagen sits.

Danish public broadcaster DR noted that the potato spills occurred on the same day as the Danish parliament passed a law to tax diesel trucks transporting heavy loads.

The new measure has drawn protests from truck drivers. In recent weeks, they peacefully blocked highways and main roads throughout the country, claiming the tax will make their livelihoods unsustainable. A majority in the Danish parliament argue it is vital as the continued use of gas and diesel-fueled trucks is environmentally unsustainable.

As of 2025, the drivers of gas and diesel-fueled vehicles over 3.5 tons (7, 716 pounds) will be taxed 1.3 kroner ($0.19) per kilometer driven (half a mile).