BANGKOK—Japan’s government vowed not to give in to terrorism after Islamic State militants released a videotaped threat to kill two Japanese citizens held hostage.

A man clad in black and speaking with a British accent said, in a video posted online Tuesday, that unless $200 million is paid to his group, two Japanese men will be executed.

The knife-wielding man is seen standing between the two Japanese, who are clad in orange jumpsuits and are kneeling on the desert ground. The man said unless Japan pays the money within 72 hours, “this knife will become your nightmare.”

Traveling in the Middle East, Japanese Prime Minister Shinzo Abe was defiant just hours after the video’s release, issuing a “strong demand” for the release of the Japanese men.

Speaking to reporters in Jerusalem, Abe said the demand to pay ransom in exchange for the lives of the hostages is unforgivable. The prime minister added that Japan will not give in to terrorism.

Middle East aid

Abe, during a visit to Cairo Saturday, as part of a $2.5 billion Middle East aid package, pledged $200 million in nonmilitary assistance for countries fighting against the Islamic State group.

That is the amount demanded on the videotape to spare the lives of the Japanese hostages.

Although he was repeatedly asked by reporters whether Japan would negotiate with the hostage-takers or pay any ransom, Abe declined to explicitly say no.

The two captives are identified as Kenji Goto, who has previously reported from war zones for Japanese news broadcasters. Goto last year apparently assisted the man who is now his fellow hostage, Haruna Yukawa, who once ran a military clothing and accessories store, in getting into Iraq.

Japan is not among the countries participating in the coalition battling insurgents in Syria and Iraq.

However, Japanese citizens have previously been killed by Islamic militants — the most notable attack was at an Algerian gas plant in 2013, where 10 Japanese died.

The Islamic State group, which controls territory in Syria and Iraq, has killed three Americans and two Britons since August, posting graphic videos of their beheadings online.

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