An American tourist was killed and another person was seriously injured on Wednesday morning during a knife attack in Portugal, police said.

A 23-year-old suspected of the stabbings has been arrested, police said.

The attack happened in the seaside town of Cascais , west of the capital.

"One of the tourists died at the scene and the other suffered serious injuries to the face and arm," a Portuguese police spokesman told AFP.

The two victims were not immediately identified, but the tourist who died was 35 years old, police said. The surviving tourist, a 33-year-old, was taken to a hospital in Lisbon, according to a police statement.

The stabbing occurred after a "trivial" verbal altercation, Portugal Judicial Police said in a statement. The suspect then got a knife from his car and

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