ISIS has declared its intention to "blow up your White House, Big Ben, and the Eiffel Tower," its official spokesman said in a new audio message.

An ISIS spokesman said Thursday that the organization had accepted a pledge of allegiance from the Nigerian terror group Boko Haram, Canada's National Post newspaper reported.

In a 28-minute Arabic-language audio, translated by the SITE Intelligence Group, ISIS spokesman Abu Muhammad al-Adnani declared that Boko Haram's move was "a new door opened by Allah" and said jihadists should go to West Africa.

Adnani said ISIS wanted control of numerous cities across the globe, including Jerusalem, Kabul, Rome, and Paris.

The ISIS spokesman warned Jews and Christians that they could either "convert to Islam or pay the ultimate price when your armies are expelled from Muhammad's peninsula, from Jerusalem, and all Muslim lands," Ynet News reported.

He said that if Jews and Christians continued on their current path, they would soon regret having done so and be incapable of preventing the surge to the caliphate. "The Jews and the Crusaders are scared and weak," said Adnani.

"We — with Allah's help — want Paris, before Rome and Islamic Iberia and after we blow up the White House, Big Ben, and the Eiffel Tower before Paris, and Rome," he warned. "The Muslims will return to power, to be the vanguard and lead in every place."

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