KABUL, AFGHANISTAN (TIP): An Afghan military helicopter crashed in a remote region of the southern Zabul province on August 6, killing 17 people on board — 12 soldiers and five crew members, officials said.

President Ashraf Ghani offered his condolences to the families of those killed, while the Taliban claimed they had shot down the aircraft.

In the capital Kabul, a suicide triuck bomb exploded in a residential area near a government complex early Friday, killing seven people and wounding about 400 others, police and health officials said.

Provincial police chief Mirwais Noorzai said the cause of the helicopter crash was not yet known and was under investigation. The defense ministry said the crash appeared to have been caused by a technical problem, without elaborating.

Afzal Aman, the defense ministry’s chief of operations, described it as “the worst calamity to hit the air force.” He confirmed the casualty figure, and said the dead included a unit commander and 11 soldiers, as well as the crew.

The Afghan military has been fighting the Taliban-led insurgency alone since US and Nato forces concluded their combat mission at the end of last year, shifting to a support and training role instead.

Aman said the helicopter was a Russian-made M-17, and was flying between Zabul’s capital of Qalat and the town of Shinkay, 20 kilometers (12 miles) away.

The Taliban statement, posted on their website, said the helicopter was “shot down with a rocket launcher.” The claim was impossible to verify and the insurgents regularly exaggerate their battlefield gains.

Meanwhile, in eastern Logar province, a suicide bomber driving an explosives-laden truck detonated his payload outside provincial government offices, killing eight people and wounding another 12.

Din Mohammad Darwish, spokesman for the governor of Logar province, near Kabul, said the dead from Thursday’s attack included three police officers and five civilians. Five police were among the wounded.

The massive blast, in the provincial capital of Puli Alam, blew out windows in buildings 500 meters (1,600 feet) away, he said.

The Taliban also claimed responsibility for that attack, saying in a statement that they targeted military and paramilitary units.

The Taliban have been in turmoil following confirmation of the death of their leader, Mullah Mohammad Omar. Afghan authorities say he died in a Pakistani hospital more than two years ago.

In Kandahar city, meanwhile, two police stations came under attack from gunmen wearing suicide vests, according to officials.

Rahmatullah Atrafi, the province’s deputy police chief, said two police officers died while five attackers were killed.

The Taliban claimed responsibility for the Kandahar attack as well.

Wahidullha Mayar, spokesman for the Health Ministry, said 147 people were wounded including 10 children in the car bomb attack in Kabul. The explosion took place in a residential area next to a government complex.

Dr Fida Mohammad in the emergency unit of Ibnisina Hospital said the bomb injured at least 20 women. He said most of the injuries were caused by flying glass.