Former Pakistani Prime Minister Nawaz Sharif arrested after return

A supporter of ousted former Pakistani prime minister Nawaz Sharif holds his picture ahead of a rally led by his younger brother.

Islamabad, Pakistan (CNN)Former Pakistani Prime Minister Nawaz Sharif and his daughter have been arrested and are being held in Islamabad after they flew back from the United Kingdom to face prison sentences, authorities said.

The return to Pakistan of Sharif and his daughter, Maryam, on Friday comes one week after a court found them guilty of corruption-related charges and sentenced them to 10 and seven years in prison, respectively.
They first flew from London to Lahore, where authorities took them into custody and escorted them onto a small government plane, which took off for Islamabad, a source who was on the first plane told CNN on condition of anonymity.
In a video released early Friday morning by the Pakistan Muslim League Nawaz (PML-N) party, Sharif could be seen addressing his supporters from inside an airplane, stating that he was returning to Pakistan as a "sacrifice for the future generations of the country and for its political stability."
    "The country is at a critical juncture right now. I have done what I could," he said. "I am aware that I have been sentenced to 10 years and will be taken to a jail cell straightaway."
    After arriving in Islamabad, Sharif and his daughter were being held in the rest house of the Sihala Police Training College, the office of Islamabad's chief commissioner said.

    Protests in the streets

    Ahead of the pair's return, PMLN members and other Sharif loyalists -- who feel the Sharifs have been unfairly targeted -- entered the streets of Lahore after Friday prayers for a procession to support them.
    The protests jammed traffic across the city into the evening.
    Former Punjab chief minister and current PMLN party head Shahbaz Sharif -- the brother of the former Prime Minister -- announced on Thursday that he would lead the "reception rally" of party workers to welcome his sibling's return.