Pakistani authorities have arrested the radical cleric mastermind behind a 2008 hotel siege in Mumbai, India, that left 166 people dead.

Hafiz Saeed, who has been designated a terrorist by the UN, was collared near the town of Gujranwala in Punjab province and charged with using two charities he operates to finance terror, officials said.

He founded the Lashkar-e-Taiba — or “Army of the Pure” — militant group that has been blamed for the four-day standoff in Mumbai in which militants stormed the Taj Mahal hotel with AK-47s.

The Jamaat-ud-Dawa and Falah-e-Insaniat charity networks he runs — which reportedly include more than 300 schools, seminaries, health services and publishing operations — were actually fronts to support Lashkar-e-Taiba, officials have charged.

Saeed, who has a $10 million bounty on his head, was placed under house arrest in 2017, but a Pakistani court ordered his release months later.

President Trump cheered the arrest on Twitter Wednesday.

“After a ten-year search, the so-called ‘mastermind’ of the Mumbai Terror attacks has been arrested in Pakistan. Great pressure has been exerted over the last two years to find him!” he tweeted.