A resident of the western suburb of Hino has been arrested on suspicion of torching an apartment under construction in neighboring Tama in September, the Metropolitan Police Department said.

Satoshi Kasuya, 22, reportedly admitted to the charge, and the police suspect he may have been behind five similar incidents in Tama that month.

All six buildings were still under construction and traces of flammable liquid were reportedly found at each site. The attacks took place in a area with radius of 2 km from Sept. 12 to 21.