An Air China jetliner returned to Central Japan International Airport near Nagoya and four others were temporarily delayed at Japan's airports Friday after receiving a bomb threat, Japanese media reported, citing the transport ministry and the Tokyo metropolitan police.

The five flights have all departed as police found no explosives aboard any of them.

The Chinese airline also ordered its all flights not to take off from Japan until security is ensured.

Air China's Flight 406, which returned to the Chubu airport ( the central Japan airport) before 4:00 PM (0700 GMT), was heading for Chongqing via Shanghai and took off from the airport shortly past 3:00 PM (0600 GMT).

And the departure of four other flights was delayed from Japan' s Narita and Fukuoka airports to carry out security check after its Tokyo office received an e-mail at around 12:50 p.m.(0350 GMT), which threatened to blast the airliner.

There were reportedly a total of 70 crew and passengers aboard the aircraft, and none of them were injured.

(Xinhua News Agency August 9, 2008)