BAGHDAD —  “Islamic State” leader Abu Bakr al-Baghdadi called for attacks against the rulers of Saudi Arabia in a speech purported to be in his name Thursday, saying his self-declared caliphate was expanding there and in four other Arab countries.

Baghdadi also said a U.S.-led military campaign against his group in Syria and Iraq was failing and he called for “volcanoes of jihad” the world over.

The authenticity of Baghdadi’s audio recording could not be confirmed. It was carried on IS-run social media.

It followed contradictory accounts out of Iraq after U.S. airstrikes last Friday about whether he was wounded in a raid. Washington has said it could not confirm whether Baghdadi was killed or wounded in Iraq following a strike near the city of Fallujah.

Baghdadi urged supporters in Saudi Arabia to take the fight to the rulers of the kingdom, which has joined the U.S.-led coalition in mounting airstrikes against IS in Syria.

The speech was not dated but carried a reference to a Nov. 7 U.S. announcement that President Obama had approved sending up to 1,500 more U.S. troops to Iraq.

“We announce to you the expansion of the Islamic State to new countries, to the countries of the Haramayn [Saudi Arabia], Yemen, Egypt, Libya, Algeria,” he said in the speech, in which he spoke at length on his group’s expansion.

Referring to Yemen, where Shi’a Houthi rebels captured Sanaa in September, forcing the government to resign, he said: “O soldiers of Yemen … be harsh against the Houthis, they are infidels and apostates. Fight them and win against them.”

Baghdadi also urged supporters in Egypt, Libya, Algeria and Morocco to prevent secular groups from ruling.