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Vehicles use alternate way on a road, which was closed with shipping containers ahead of a planned rally by supporters of imprisoned former Prime Minister Imran Khan's Pakistan Tehreek-e-Insaf party, in Islamabad, Pakistan, on Nov. 23.Anjum Naveed/The Associated Press

Pakistan has sealed off the capital, Islamabad, ahead of a planned rally by supporters of imprisoned former premier Imran Khan.

It’s the second time in as many months that authorities have imposed such measures to thwart tens of thousands of people from gathering in the city to demand Khan’s release. The rally is planned for Sunday.

The latest lockdown coincides with the visit of Belarusian President Alexander Lukashenko to Islamabad on Monday.

Local media reported that the Interior Ministry is considering a suspension of mobile phone services in parts of Pakistan in the coming days. On Friday, the National Highways and Motorway Police announced that key routes would close for maintenance.

It advised people to avoid unnecessary travel and said the decision was taken following intelligence reports that “angry protesters” are planning to create a law and order situation and damage public and private property during Sunday’s planned rally.

“There are reports that protesters are coming with sticks and slingshots,” the statement added.

Shipping containers in different colors, a familiar sight to people living and working in Islamabad, reappeared on key roads Saturday to throttle traffic.

Pakistan has already banned gatherings of five or more people in Islamabad for two months to deter Khan’s supporters and activists from his Pakistan Tehreek-e-Insaf party, or PTI.

Authorities have also installed containers to block highways and roads linking the PTI strongholds of Punjab and Khyber Pakhtunkhwa to stop people reaching Islamabad.

Ali Amin Gandapur, the chief minister of Khyber Pakhtunkhwa, said he would lead the march from the northwest and that arrangements had been made to remove hurdles and blockades.

Khan has been in prison for more than a year and has over 150 criminal cases against him. But he remains popular and the PTI says the cases are politically motivated.

A three-day shutdown was imposed in Islamabad for a security summit last month.

Meanwhile, fighting between armed Sunni and Shiite groups in northwestern Pakistan killed at least 37 people and injured 25 others, a senior police officer from the region said Saturday.

The overnight violence was the latest to rock Kurram, a district in Khyber Pakhtunkhwa province, and comes days after a deadly gun ambush killed 42 people.

Shiite Muslims make up about 15% of the 240 million people in Sunni-majority Pakistan, which has a history of sectarian animosity between the communities.

Although the two groups generally live together peacefully, tensions remain, especially in Kurram.

The station house police officer in Kurram, Saleem Shah, said armed men in Bagan and Bacha Kot torched shops, houses and government property.

Intense gunfire was ongoing between the Alizai and Bagan tribes in the Lower Kurram area.

“Educational institutions in Kurram are closed due to the severe tension. Both sides are targeting each other with heavy and automatic weapons,” said Shah.

Videos shared with The Associated Press showed a market engulfed by fire and orange flames piercing the night sky. Gunfire can also be heard.

The location of Thursday’s attack was also targeted by armed men, who marched on the area.

Survivors of the gun ambush said assailants emerged from a vehicle and sprayed buses and cars with bullets. Nobody has claimed responsibility for the attack and police have not identified a motive.

Dozens of people from the district’s Sunni and Shiite communities have been killed since July, when a land dispute erupted in Kurram that later turned into general sectarian violence.

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