Record monsoon rains in south and southwest Pakistan and glacial melt in northern areas triggered the flooding that has impacted nearly 33 million people in the South Asian nation of 220 million.

Khan's comments came on the eve of a visit to Moscow, where he will meet President Vladimir Putin – the first visit by a Pakistani leader to Russia in two decades.

There have been growing warnings of the humanitarian crisis facing Afghanistan since international aid was abruptly cut following the Taliban takeover on August 15.

Separatist insurgents from the Baloch Liberation Army claimed responsibility for the blast in a statement.

The mass demonstration in Karachi was launched by Pakistan Democratic Movement, formed last month by nine major opposition parties to begin a nationwide agitation against the government.

The building is in a high security zone in Karachi and also houses the head offices of many private banks.

Pakistan on Saturday lifted precautionary restrictions on congregational prayers.

More than 200 people have been hospitalised or treated for breathing problems since Sunday.

The official was immediately put on a flight to Washington DC on arrival at Doha with his passport and boarding pass in the hands of the flight crew.

Qureshi told reporters that as per information the attack "could take place between April 16 and 20".

The leader of the Tehreek-e-Labbaik (TLP) party, Khadim Hussain Rizvi, and other senior figures were detained last month after they shut down major cities in protest at the acquittal of a Christian woman.

The attack which was claimed by the separatist Balochistan Liberation Army insurgent group.

Sharif and his family were jailed as they could not explain how they obtained funds to purchase four luxury flats in London's exclusive Hyde Park area.

Military courts were first set up by the parliament in early 2015 in response to an attack by Pakistani Taliban fighters on a military-run school that killed 134 children.

A corruption investigation into Pakistan's loss-making carrier is currently on.

The bombing at the famed Lal Shahbaz Qalandar shrine in southern Sindh province was Pakistan's deadliest attack in two years, killing at least 83 people

ISIS has claimed responsibility for the attack on Lal Shahbaz Qalandar shrine in southern Pakistan.