Public broadcaster NHK faced a terror scare for the second straight day on Monday when it received an envelope containing what resembled a rifle bullet, the network said. The package reached the station's headquarters in Tokyo by mail in the evening with the bullet-like object attached to a piece of paper, NHK said.
"We have sent the bullet-like metal to the Metropolitan Police Department for examination," a police spokesman said.
On Sunday, an explosion went off at the entrance of a regional NHK branch in Fukuoka, but no one was hurt, police said.
The word "Sekihotai" was printed on the piece of paper, NHK said. Sekihotai was the name of an unknown group which has claimed responsibility for four firearms and home-made bomb attacks at facilities belonging to the influential newspaper Asahi in 1987 and 1988.
In one attack, a reporter was killed and another was injured when a masked man sprayed shotgun fire at a local Asahi bureau in Nishinomiya near Osaka.
No one has been arrested for the incidents but a middle-aged man has confessed to attacking the Nishinomiya bureau in a series of magazine articles in recent weeks. But Asahi has rejected the confessions as fictitious.© Wire reports