Al-Qaida leader Ayman al-Zawahiri is urging followers for Jihadist Unity, around the world against what he calls the "international satanic alliance."

In a 28-minute undated audio-video message that surfaced Wednesday, Al-Qaida leader al-Zawahiri said, "We are facing the fiercest attack in the history of Muslims. The Crusaders, atheist Russia, China, Rawafidh [rejectionists], secularists and the treacherous rulers have all joined hands against us."

VOA could not independently verify the authenticity of the message.

Al-Zawahiri took charge of the al-Qaida terror organization after his predecessor, Osama bin Laden, was killed in a U.S. Navy SEAL raid in 2011 in Pakistan's Abbottabad. His precise whereabouts are unknown, but security analysts think he most likely is hiding in the Afghan-Pakistan border region.

The message, released less than a month after the 16th anniversary of the Sept. 11, 2001, terrorist attacks on the U.S., came as the terror organization is facing a series of defeats around the world, particularly in Syria, where its offshoot groups are being squeezed by the Russian-backed Syria government. (VOA)