Japanese police investigating an explosion among luggage taken off a Canadian Pacific Airlines jet yesterday have found numerous metal fragments in the area where the blast occurred and in the bodies of the two men whom it killed, police reported today.

Metal fragments often indicate the presence of a bomb. However, police said they were still unable to determine positively the cause of the explosion, which took place in a baggage sorting room at Tokyo's Narita International Airport, located 30 miles east of the city.

Meanwhile, a Japanese airliner carrying 199 people on a domestic flight made an emergency landing after a telephone caller said there were bombs on the plane, according to an Associated Press report from Tokyo.

An airline spokesman, Hiroyuki Ito, said an anonymous caller declared that bombs would explode at 2:20 p.m. aboard ANA's Flight 63, and the plane made an emergency landing at Akita, northern Japan. No bombs were found on the plane, carrying 184 passengers and 15 crew, or in luggage, the news agency reported.

In the blast yesterday, the CPA aircraft, a Boeing 747 jumbo jet designated as Flight 003, had just completed a nine-hour trip from Vancouver.

Japanese police and aviation specialists have speculated that the incident was linked to the crash off Ireland Sunday of an Air-India Boeing 747, which appears to have been destroyed by a mid-air explosion, apparently killing all 329 passengers and crew.

Japanese police today were still poring over manifests from the CPA jet, which was carrying 374 passengers, most of them Japanese, and a crew of 16.

The passengers included two Indian nationals, police said tonight, but they were unable to provide further information about them.

A phone caller allegedly from a radical Sikh group claimed responsibility for the crash of the Air-India jet.

The blast here killed two baggage handlers and injured four other airport employes.