A knife attack in Cascais, Portugal, on Wednesday morning left one American tourist dead and another seriously injured.

The victims, a 35-year-old who died at the scene and a 33-year-old hospitalized in Lisbon, were attacked following a minor verbal dispute.

Police arrested a 23-year-old suspect, who had retrieved a knife from his car and fled before being apprehended.

The Portuguese Judicial Police described the altercation as “trivial,” CBS News has reported.

Authorities have not yet released the identities of the victims.