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Ousted Pakistani Prime Minister Nawaz Sharif and his daughter Maryam sit on a Lahore-bound flight due for departure, at Abu Dhabi International Airport, UAE July 13, 2018.

Nawaz Sharif, Maryam Nawaz, and Capt (retd) Safdar on Monday filed an appeal in the IHC challenging the accountability court verdict in the Avenfield property reference.

They landed in Lahore and were then taken to the capital, the statement said.

"It is very unfortunate that Mian Muhammad Nawaz Sharif, three time Prime Minister of Pakistan, is being treated in such a shabby manner".

He said the election commission has requested that the army assist in organizing a "fair and free" election on July 25 and more than 370,000 troops are being deployed at polling stations around Pakistan to achieve the objective.

The arrest was made in connection with a recent verdict from an anti-corruption court.

Sharif, 68, and his daughter Maryam, 44, were arrested in Lahore on Friday on their arrival from London after an accountability court found them guilty on July 6 over his family's ownership of four luxury flats in London.

PML-N leaders say authorities have began a crackdown against union council leaders, the street-level party workers who bring out people on the streets. "It is a pre-poll rigging", PML-N spokesperson Marriyum Aurenzeb said.

The father-daughter duo was in London to meet Sharif's ailing wife Kulsoom Nawaz, who is undergoing treatment for cancer.

PML-N leaders have accused Pakistan's powerful military, which has an influential role in domestic and foreign affairs, of attempting to destabilize the party ahead of the elections.

Sharif had stepped down as prime minister in July past year after the apex court's ruling.

The case pertains to the purchase of Avenfield apartments through offshore companies, the beneficial owner of which was Maryam.

Nawaz and his family are facing corruption references filed by the National Accountability Bureau (NAB) in the light of Supreme Court's July 28 judgment in the Panama Papers case.

The party's past five years in government have been characterised by discord with the military, which has ruled Pakistan for almost half its 71-year history.

A appeal was also filed against conducting the proceedings of the remaining two corruption cases within the Adiala jail premises, it added.

Underscoring the tensions roiling the election campaign, suicide bomber hit a campaign convoy of a Baluchistan provincial assembly candidate in southwestern Pakistan on Friday, killing 10 people, a police official said.