ISLAMABAD -- Militants in Afghanistan fired heavy weapons across the border into a Pakistani military outpost overnight, killing three personnel, the army said Saturday, in the latest violence to rattle the region.
A firefight ensued with the militants firing toward the army post in Pakistan's rugged North Waziristan region, and several people were killed, the statement said. There was no immediate way to independently confirm details of the attack.
It comes as Afghanistan is reeling from a series of explosions in recent days, including the bombing of a mosque in northern Kunduz province Friday that killed 33 people, including several students of an adjacent religious school or madrassa.
The violence included an attack Thursday on the Abdul Rahim Shaheed school in Kabul that killed seven children. It reopened Saturday, with children remembering their fallen classmates with roses.
The increase in attacks in Afghanistan -- as well as in neighboring Pakistan -- highlights the growing security challenge facing Afghanistan's Taliban rulers, who swept to power in August in the closing days of the withdrawal of American and NATO troops ending their 20-year war.
Even as their religiously motivated edicts, which seemed reminiscent of their late 1990s rule, drew harsh criticism, their seemingly heavy-handed approach to security brought early expectations of improved safety.
However, an Islamic State affiliate known as the Islamic State in Khorasn Province, or ISIS-K -- which claimed the recent spate of attacks in Afghanistan as well as a growing number in neighboring Pakistan -- is proving an intractable challenge.
ISIS-K took responsibility for a series of attacks across Afghanistan on Thursday, most of which targeted the country's minority Shiites.
Another group, the Pakistani Taliban, known as the Tehreek-e-Taliban Pakistan, or TTP -- which the United Nations says numbers around 10,000 in Afghanistan -- has stepped up its assault on Pakistan's military outposts from its Afghan hideouts.
Afghanistan's Taliban rulers have promised no militant group would use its soil as a base to attack another country, but Kabul has yet to arrest or hand over any TTP leaders in Afghanistan to Pakistan. Other militant groups also operating in Afghanistan include China's militant Uighurs of East Turkistan Movement, which seeks independence for northwest China, and the Islamic Movement of Uzbekistan.
Some of the groups are loosely allied to the ISIS-K , while others act more independently, but on Saturday Pakistan's military statement warned Afghanistan's Taliban rulers to do more.
"Pakistan strongly condemns the use of Afghan soil by terrorists for activities against Pakistan and expects that the Afghan Government will not allow conduct of such activities, in future," said the Pakistan military statement.
Separately, the Taliban on Saturday closed the lucrative Islam Qala border crossing with Iran after the two countries squabbled over a road Afghanistan's Taliban rulers planned to build in the area, the official IRNA news agency reported.
Iran media said the dispute was handed over to the Iranian and Afghan interior ministries to sort out.
Iran and Afghanistan share three border crossings along their more than 560-mile border.
Information for this article was contributed by Tameem Akhgar, Mohammad Shoaib Amin, Afghanistan and Nasser Karimi of The Associated Press.
Afghan students hold rose on the first day of school after Tuesday's explosion in front of their school, in Kabul, Afghanistan, Saturday, April 23, 2022. On Saturday, the Abdul Rahim Shaheed School, which was among the IS-K targets in the Tuesday attacks, re-opened. The school's principal handed each student a pen and a flower as they began classes on Saturday. (AP Photo/Ebrahim Noroozi)
Afghan students hold rose on the first day of school after Tuesday's explosion in front of their school, in Kabul, Afghanistan, Saturday, April 23, 2022. On Saturday, the Abdul Rahim Shaheed School, which was among the IS-K targets in the Tuesday attacks, re-opened. The school's principal handed each student a pen and a flower as they began classes on Saturday. (AP Photo/Ebrahim Noroozi)
An Afghan student stands behind the classroom window after taking a rose on the first day of school after Tuesday's explosion in front of his school, in Kabul, Afghanistan, Saturday, April 23, 2022. On Saturday, the Abdul Rahim Shaheed School, which was among the IS-K targets in the Tuesday attacks, re-opened. The school's principal handed each student a pen and a flower as they began classes on Saturday. (AP Photo/Ebrahim Noroozi)
A bouquet of flowers is placed as a tribute on the desk of 19-year-old Parviz Noori who was killed on Tuesday's explosion in front of his school, in Kabul, Afghanistan, Saturday, April 23, 2022. On Saturday, the Abdul Rahim Shaheed School, which was among the IS-K targets in the Tuesday attacks, re-opened. The school's principal handed each student a pen and a flower as they began classes on Saturday. (AP Photo/Ebrahim Noroozi)
Roses are placed on empty desks as a tribute to students who were killed Tuesday's explosion in front of the Abdul Rahim Shaheed School, in Kabul, Afghanistan, Saturday, April 23, 2022. On Saturday, the Abdul Rahim Shaheed School, which was among the IS-K targets in the Tuesday attacks, re-opened. The school's principal handed each student a pen and a flower as they began classes on Saturday. (AP Photo/Ebrahim Noroozi)