TOKYO (AP) — A man threw several firebombs into the headquarters of Japan’s ruling party in Tokyo Saturday, public broadcaster NHK and other Japanese media reported. There were no reports of injuries.

Tokyo police declined to comment, noting the matter was still under investigation. The man, arrested on the spot, had driven his car into nearby fencing, the news reports said. His motive for the attack was not immediately clear.

The ruling Liberal Democratic Party is increasingly unpopular with the public due to a ballooning money scandal involving dubious funding and suspected tax evasion.

The party declined to comment on Saturday’s attack, referring all queries to the police.