A Pakistan passenger plane with more than 100 people believed to be on board crashed in the southern city of Karachi on Friday, the country's aviation authority said.

Images aired on national television showed the Pakistan International Airlines flight had smashed into a residential area, with clouds of thick black smoke billowing from the site.

"The plane crashed in Karachi. We are trying to confirm the number of passengers but initially it is 99 passengers and eight crew members," said Abdul Sattar Khokhar, the spokesman for the country's aviation authority, adding that the flight was coming from Lahore.  

It comes just days after the country began allowing commercial flights to resume after planes were grounded during a lockdown over the coronavirus pandemic.

Pakistan has a chequered military and civilian aviation safety record, with frequent plane and helicopter crashes over the years.

In 2016, a Pakistan International Airlines plane burst into flames after one of its two turboprop engines failed while flying from the remote northern to Islamabad, killing more than 40 people.

The crash comes as Pakistanis across the country are preparing to celebrate the end of Ramadan and the beginning of Muslim holiday Eid al-Fitr, with many travelling back to their homes in cities and villages.