The Islamic State militant group has released an audio recording it claims is of its chief Abu Bakr al-Baghdadi, days after an air strike sparked rumours he had been wounded or killed.
The man purported to be Mr Baghdadi made no direct reference to the alleged strike in the 17-minute audio, but did mention developments that have occurred since.
"Be assured, O Muslims, for your state is good and in the best condition," he said, according to an English transcript of the message released together with the recording.
In the message, Mr Baghdadi called for attacks in Saudi Arabia, said his caliphate was expanding across the Arab world, and called for "volcanoes of jihad".
Mr Baghdadi also said a United States-led military campaign against IS in Syria and Iraq was failing. The authenticity of the speech, which was carried on jihadist websites, has not yet been independently confirmed.
There have been contradictory accounts from Iraq following US air strikes on Friday about whether Mr Baghdadi was wounded in a raid.
The United States said on Tuesday it could not confirm whether he was killed or wounded in Iraq following a strike near the city of Fallujah.
The speech was not dated, but carried a reference to a US announcement on 7 November that President Barack Obama had approved sending up to 1,500 more U.S. troops to Iraq.
"O sons of al-Haramayn (Saudi Arabia)...the serpent's head and the stronghold of the disease are there...draw your swords and divorce life, because there should be no security for the Saloul," Mr Baghdadi said, using a derogatory term to refer to the leadership of Saudi Arabia.
IS militants have seized swathes of Syria and Iraq, declaring a caliphate over territory it controls in June.
Baghdadi said he had accepted oaths of allegiance from supporters in Libya, Egypt, Yemen, Saudi Arabia, and Algeria.
"Oh soldiers of the Islamic State...erupt volcanoes of jihad everywhere. Light the earth with fire against all dictators," Baghdadi said.
Referring to US-led military action against his group, he said: "Despite this crusade campaign being the most fierce and severe of all, it is the greatest failure."
"We see America and its allies stumbling in fear, weakness, impotence, and failure."
