Youths ride their bicycles along a street during a lockdown imposed in Karachi, Pakistan. AFP

The border restrictions were announced Sunday as the country prepared to mark the Muslim holiday of Eid Al Fitr, which usually sees the mass movement of people between cities and villages as well as the return of migrant workers and overseas Pakistanis for celebrations.

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Pakistani officials have anxiously watched the coronavirus crisis unfolding in neighbouring India.

The Civil Aviation Authority said Saturday that from Wednesday, 80 per cent of flights would be suspended for two weeks, mainly from the Middle East, until mid-May when the Eid holidays are over.

Commuters drive on a street during lockdown in Peshawar. AFP

Foot crossings with Iran and Afghanistan would also be sealed, the country's coronavirus task force said, adding that trade would be exempt.

Flights and land crossings with neighbouring India — reeling from a devastating outbreak with hundreds of thousands of new cases a day — were closed before the pandemic because of political tensions.

Impoverished Pakistan is struggling to contain a third wave of infections, with more than 800,000 cases and 18,000 deaths declared.

Only a small fraction of its 220 million population has been vaccinated.

Planning minister Asad Umar, who has been leading the government response to the outbreak, said the next two weeks are "critical", as health authorities rushed to increase intensive care capacity.

Last year, Pakistan saw a spike in cases following Ramadan and Eid.

A man crosses the street in a deserted area of a commercial market during lockdown in Peshawar. AFP

Mosques have remained open throughout the month of Ramadan, with few adhering to social distancing guidelines during huge nightly gatherings of worshippers.

Private gatherings, shops and restaurants have faced tight restrictions, with the army mobilised to help enforce rules.