Junko Ishido, mother of Japanese journalist Kenji Goto who was held captive by Islamic State militants, touches her head as she speaks to reporters at her house in Tokyo February 1, 2015. [Photo/Agencies]

TOKYO - Appalled and saddened by news Sunday of journalist Kenji Goto's beheading, apparently by Islamic State extremists, Japan ordered heightened security precautions, but vowed not to give in to terrorism.

The failure to save Goto raised fears for the life of a Jordanian fighter pilot also held hostage. Unlike some earlier messages, there was no mention of the pilot in an online video purporting to show an Islamic State group militant beheading Goto, circulated via social media late Saturday by militant sympathizers.

The slaying of Goto, a freelancer whose work focused on refugees, children and other victims of war, shocked this country, which until now had not become directly embroiled in the fight against the militants.

"I feel indignation over this immoral and heinous act of terrorism," Prime Minister Shinzo Abe told reporters after convening an emergency Cabinet meeting.

"When I think of the grief of his family, I am left speechless," he said. "we are filled with deep regret."

Threats from the Islamic State group prompted an order for tighter security at airports and at Japanese facilities overseas, such as embassies and schools, government spokesman Yoshihide Suga said.

He said it would be "inappropriate" to comment on the status of the Jordanian pilot, Muath al-Kaseasbeh. He was captured in December when his F-16 crashed near the de facto capital of the Islamic State group, which controls about a third of both Syria and neighboring Iraq in a self-declared caliphate.

Jordan's government spokesman, Mohammed al-Momani, also declined comment. Earlier this week, Jordan offered to free an al-Qaida prisoner for the pilot, but demanded and said it never got proof he was still alive.

With no updates for days, al-Kaseasbeh's family appealed to the government for information on his situation. But for Goto's family and friends, the beheading shattered any hopes for his rescue.