Pakistan's former Prime Minister Imran Khan was arrested on Tuesday on corruption charges. Government officials alleged the former premier and his wife received land as a bribe through a charitable trust.

Khan and his aides have denied any wrongdoing. Here are some facts about the trust and the land acquisition: 

Al-Qadir Trust is a non-governmental welfare organization set up by Bushra Watto, Khan's third wife, and Khan in 2018 when he was still in office.

WHAT IS AL-QADIR TRUST? 

While prime minister, Khan promoted the trust at official events. The couple is sole trustee of the trust, according to Law Minister Azam Nazeer Tarar.

The trust runs a university outside Islamabad devoted to spirituality and Islamic teachings, a project inspired by the former first lady, who is also commonly known as Bushra Bibi and has a reputation as a spiritual healer.

WHAT DOES THE TRUST DO?

Khan has publicly described her as his spiritual leader and said she helped guide him towards a spiritual path.

Interior Minister Rana Sanaullah told that the trust was a front for Khan to receive valuable land as a bribe from a real estate developer, Malik Riaz Hussain, who is one of Pakistan's richest and most powerful businessmen.

WHAT IS THE CORRUPTION CASE?

The trust has nearly 60 acres of land worth seven billion Pakistani rupees ($24.7 million) and another large piece of land in Islamabad close to Khan's hilltop home, the minister said.

The 60-acre parcel is the official site of the university but very little has been built there. 

The government said the scheme originated with 190 million pounds repatriated to Pakistan in 2019 by Britain after Hussain forfeited cash and assets to settle a British probe into whether they were proceeds of crime.

HOW WAS THE BRIBE ALLEGED TO HAVE WORKED? 

Instead of putting it in Pakistan's treasury, Khan's government used the money to pay fines levied by a court against Hussain for illegal acquisition of government lands at below-market value for development in Karachi.

The interior minister alleged Malik Riaz Hussain gave the land to Khan through the Al-Qadir Trust in exchange for that favour.