An explosive device killed a conservative politician as he drove through northern Albania on Thursday, 10 days ahead of the country's parliamentary election, police said.
The leader of the victim's political party called it a terrorist attack, but police suggested organized crime groups may have been responsible.
Albanian electoral campaigns often are tense and marred by violence and irregularities. Last week, a man was fatally shot following an argument over a campaign poster, and in May an opposition lawmaker was killed.
Police said Aleksander Keka, a 34-year-old regional leader of Albania's opposition Christian Democratic Party, died in the explosion while driving near Shkodra, a city 120 kilometers (75 miles) north of Tirana, the capital.