Japan, reeling from the murder of two nationals by Islamic State extremists, will offer an extra $15 million in aid to fight terrorism in Middle East and Africa, a report said Sunday.

Japan hopes to demonstrate its resolve not to cave in to terrorism with the fresh assistance, which will be announced at a global counter-terrorism conference starting on Wednesday in Washington, the Sankei Shimbun said.

King Abdullah II of Jordan expressed readiness to aid and train the Lebanese army as Interior Minister Nouhad al-Mashnouq began an official visit to Amman.

“We are one... Jordan is ready to offer the Lebanese army all its needs of arms and military equipment, including free training at all our bases,” sources quoted King Abdullah II as saying in comments in al-Mustaqbal newspaper on Thursday.

Bahrain's ruler has told his Jordanian counterpart that he is ready to assist the kingdom in its fight against the Islamic State group, the royal palace in Amman said Monday.

King Hamad of Bahrain, quoted in a palace statement, told King Abdullah II that he was "proud to provide all the help Jordan needs to combat terrorism and protect Islam from Daesh (IS)."

A squadron of warplanes from the United Arab Emirates arrived Sunday in Jordan to help the kingdom in its fight against the Islamic State group, state media reported.

The F-16 fighter jets were deployed at a Jordanian air base along with UAE pilots and technicians, said the kingdom's official Petra news agency.

Jordan said Sunday it destroyed 56 targets in three days of strikes on the Islamic State group after it murdered one of its pilots, and is determined to destroy IS.

Air Force chief Major General Mansour al-Jobour did not specify where the strikes took place, but told reporters the air raids launched since Thursday had destroyed 20 percent of IS capabilities.

The parents of a U.S. hostage who Islamic State jihadists claimed had been killed in an airstrike said on Friday they were "hopeful" she was still alive and appealed to her captors to contact them.

The militants said Kayla Jean Mueller had been buried under rubble after a raid by a Jordanian warplane in the Syrian city of Raqa, the extremists' self-proclaimed "capital."

The burning alive of a Jordanian pilot by the Islamic State group is a "turning point" in the kingdom's fight against the jihadists, a minister said in remarks published Saturday.

Air strikes carried out so far by Jordan's air force were "the beginning of an ongoing process to eliminate" IS, Interior Minister Hussein Majali said, quoted by government newspaper Al-Rai.

The Islamic State group said a coalition air strike Friday killed an American woman it was holding hostage in Syria, in a claim that could not be immediately verified.

In Jordan, meanwhile, thousands of people marched to demand retribution against IS for murdering a captive pilot.

King Abdullah II of Jordan, a member of the U.S.-led coalition battling the Islamic State group, faces the toughest challenge of his 16-year reign after IS murdered a downed pilot.

One of Washington's closest allies in the region, Abdullah was catapulted into the forefront of the conflict with the jihadists after IS burned the captured Jordanian airman alive.

Jordan on Thursday released from jail a key Salafist figure and former al-Qaida mentor arrested in October for allegedly propagating "terrorist" ideas, a judicial source said.

The decision to free Issam Barqawi, who was once mentor to slain al-Qaida leader in Iraq Abu Musab al-Zarqawi, was taken by the head of the state security court, a military tribunal.