Police in Japan have issued an arrest warrant for the former general manager of the luxurious Grand Hyatt Tokyo hotel for the alleged sexual assault of a female customer in May, according to reports.

Spanish national Antonio Alvarez, 45, is suspected of sexually assaulting the woman in a hotel bathroom.

The Japan Times reports:

Alvarez is suspected of forcibly taking a female customer in her 20s into a multipurpose bathroom at the hotel at around noon on May 30.

Alvarez, whose whereabouts are unknown at this time, was general manager at the upscale Roppongi district hotel for nine months before he quit his job and left the country in August. He will be arrested if he re-enters the country, police said.

The suspect had earlier cooperated with police, but subsequent DNA tests prompted the issuing of the arrest warrant.

The hotel has formally apologised for the incident.