Philippine prosecutors have quashed a complaint filed by police against a Japanese man, his Filipino wife, and four other men over the killing of a Japanese travel executive in Manila in May.

Napoleon Ramolete, deputy city prosecutor of Paranaque, a Manila suburb where Hiroshi Iwasaki, 59, was murdered, said city prosecutor Amerhassan Paudac approved on June 30 a request by Iwasaki's wife, Illuminada, to quash the complaint so as not to "put on trial certain persons whose participation in the crime has not been sufficiently established."

Iwasaki, an executive director of a travel and tours agency that maintains an office in a hotel in the Makati financial district, was driving home on the night of May 6 when one of two men on a motorcycle shot him dead.