An unidentified gunman shot dead an American and wounded another in the Saudi capital on Tuesday when he opened fire on their vehicle, police said.

An unidentified gunman shot dead an American and wounded another in the Saudi capital on Tuesday when he opened fire on their vehicle, police said.

Security forces arrested the assailant following the afternoon attack at a petrol station in eastern Riyadh, a police spokesman said in a statement carried by the SPA state news agency.