Meanwhile, tens of thousands of supporters and leaders of Sharif's Pakistan Muslim League-Nawaz (PML-N) party flooded the streets in Lahore on Friday in anticipation of the arrest of their leader.
With reference to the sentence given to former prime minister Nawaz Sharif and Maryam Nawaz in Avenfield properties case, Shehbaz said the trial of terrorists, not political leaders, is carried out in jails.
Ousted Pakistani Prime Minister Nawaz Sharif sits on a plane after landing at the Allama Iqbal International Airport in Lahore, Pakistan, July 13, 2018.
His daughter Maryam was also arrested after the pair were were sentenced in absentia on corruption charges last week.
The paper slammed confusion of authorities about where to lodge them after their arrest.
Pakistani and worldwide rights groups have accused the military of seeking to maintain its influence in Pakistani politics by keeping Sharif out of power. The party's past five years in power has been punctuated by the civil-military discord that has plagued Pakistan since its inception.
Earlier, Sharif and Maryam flew to the UAE capital from London, where Sharif's wife Kulsoom, suffering from throat cancer, is battling for her life.
With tearful eyes, Sharifs' elderly mother hugged Nawaz Sharif and Maryam, kissed them and patted their backs.
The Pakistan Muslim League-Nawaz (PML-N) leader complained to the legal team about the lack of facilities in the room in which he is being kept. It said that the expenses of such facilities are borne by "A" and "B" class prisoners if they have a permission from the jail department.
After the Supreme Court disqualified Sharif in July 2017 for not declaring a small source of income which he denied receiving, he toured the nuclear-armed country urging voters to protect the "sanctity of the vote".
"Some 25 PML-N workers and policemen have been injured in this clash", he said.
The opposition Pakistan People Party (PPP) also alleged "pre-poll rigging" this week, but did not specifically name the armed forces. So, the daring move by Nawaz Sharif did indeed unsettle the powers that be; those who continue to maintain a facade of a democratic set-up, yet put the very same democratically elected government in jeopardy when things don't go their way.
Sharif was the 15th prime minister in Pakistan's 70-year history - roughly half of it under military rule - to be removed before completing a full term.
Sharif's child in-law Mohammad Safdar was additionally granted a one-year sentence.
"There seems to be a conspiracy to sabotage the 25 July elections but the people of Pakistan will not allow any design meant to target these historic elections to succeed", he tweeted.
The PML-N had been seen as favourites for re-election until recently but have appeared to lose ground to Imran Khan.
PML-N has also had internal divisions.
The Sharif's return came at the end of a tense day of political protest in Lahore which saw up to 20,000 rally in his support despite a sweeping security crackdown.
Ch Parvez Elahi said that the PML-N President should not become the Election Commission, now administration and police are not subordinate to his orders, which he is habitual of threatening and getting his desired orders implemented and also using against his opponents.
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