Scores of Taiwanese fishermen have protested outside Japan's representative office in Taiwan to demand an apology and the return of one of their fishing boats seized by the Japanese coast guard.

The fishermen lobbed eggs and clashed briefly with police while delivering a petition Wednesday at the Interchange Association, which handles relations between the two in the absence of diplomatic ties.

Taiwan has called the boat's seizure Monday about 150 nautical miles (278 kilometers) southeast of Japan's Okinotori islands an illegal act, saying it was fishing in international waters at the time.

Japan has demanded the posting of a $54,442 bond for the release of the boat and its 10 crew members.

Chairman of the national fishermen's association Lin Chi-tsang compared the seizure to an act of piracy.