Injured men lie on bed at a hospital after the Wednesday's attack and shooting at a military hospital in Kabul, Afghanistan, Thursday, March 9, 2017. Gunmen wearing white lab coats stormed a military hospital Wednesday, killing dozens of people and wounding dozens in an attack claimed by the Islamic State group. (AP Photo/Rahmat Gul)
The Associated Press
KABUL, Afghanistan (AP) - Hundreds of mourners gathered Thursday at a graveyard on the northern edge of Kabul to bury a 37-year-old pharmacist - one of 31 people killed in an attack on a hospital in the Afghan capital the previous day that was claimed by the Islamic State group.
The brazen daytime assault saw four gunmen in white lab coats storm the military hospital in a highly secure part of the city Wednesday, setting off an hours-long gunbattle with security forces. Initially, the death toll was reported to be 30 but one of the wounded died overnight.
Behroz Behnam, who left behind three small children, was gunned down on the third floor of the hospital, said his brother, Behzad, also an officer in the Afghan army.
Behzad, who had been deployed with the military outside the hospital during the attack, said the gunmen went floor by floor in a killing rampage. When they came to Behnam, they opened fire at him and two other officers, said Behzad.
When he made it inside the hospital, Behzad found his brother dying from gunshot wounds to the chest and arm.
"When I finally got to him, it was just moments before he died," Behzad said. "All that was left for me to do was to tell my family and bring his body home."
All the attackers, including two who detonated their suicide vests, were killed by the time the assault ended.
Standing beside Behnam's graveside covered with flowers, his father, Afghan army Gen. Jalandar Shah made an impassioned plea to the international community to help war-battered Afghanistan put an end to the fighting.
"As a father, as a human being I am calling out to the international community to please pay attention," he said. "Stop the killing of Afghans. It is enough all this killing. It's enough."
Inside the hospital, experts were scouring every inch of the facility for evidence that IS was behind the attack, which also wounded 53 people, said deputy defense ministry spokesman Mohammed Radmanish.
Radmanish told The Associated Press that even though IS claimed the assault, Afghan authorities "must do our own investigations to know who is responsible."
Afghan forces have been under increasing pressure by the Taliban and also from Islamic State militants, mostly in the country's east.
Wednesday's attack reflected the Afghan militants' capability to strike at the country's heavily guarded capital despite government efforts to improve security for ordinary Afghans.
Villagers stand at the grave of Behroz Behnam, a victim of Wednesday's deadly suicide attack and shooting at a military hospital, in Kabul, Afghanistan, Thursday, March 9, 2017. Hundreds of mourners gathered Thursday at a graveyard on the northern edge of Kabul to bury Behnam, a 37-year-old pharmacist - one of over 30 people killed in an attack on a hospital in the Afghan capital the previous day that was claimed by the Islamic State group. (AP Photo/Amir Shah)
The Associated Press
An Afghan soldier stands guard at a military hospital after an attack in Kabul, Afghanistan, Wednesday, March 8, 2017. Afghanistanâs Defense Ministry said more than 30 people have been killed in this morningâs attack on the military hospital in Kabul. An affiliate of the Islamic State group is claiming responsibility for the attack, which happened in Kabulâs heavily guarded diplomatic quarter. (AP Photo/Rahmat Gul)
The Associated Press
An Injured man receives treatment at a hospital after the Wednesday's attack at a military hospital in Kabul, Afghanistan, Thursday, March 9, 2017. Gunmen wearing white lab coats stormed a military hospital in Afghanistan's capital on Wednesday, killing dozens of people in an attack claimed by the Islamic State group. (AP Photo/Rahmat Gul)
The Associated Press
An injured man receives treatment at a hospital after the Wednesday's attack and shooting at a military hospital in Kabul, Afghanistan, Thursday, March 9, 2017. Gunmen wearing white lab coats stormed a military hospital on Wednesday, killing dozens of people and wounding dozens in an attack claimed by the Islamic State group.(AP Photo/Rahmat Gul)
The Associated Press
An injured man in Wednesday's attack on a military hospital is moved at a military hospital in Kabul, Afghanistan, Thursday, March 9, 2017. Gunmen wearing white lab coats stormed a military hospital in Afghanistan's capital on Wednesday, killing dozens of people and wounding dozens in an attack claimed by the Islamic State group. (AP Photo/Rahmat Gul)
The Associated Press
Afghan health workers carry a wounded Afghan at a hospital after the Wednesday's attack and shooting at a military hospital in Kabul, Afghanistan, Thursday, March 9, 2017. Gunmen wearing white lab coats stormed a military hospital on Wednesday, killing dozens of people and wounding dozens in an attack claimed by the Islamic State group. (AP Photo/Rahmat Gul)
The Associated Press
Security forces inspect the site of attack on a military hospital in Kabul, Afghanistan, Wednesday, March 8, 2017. Gunmen stormed a military hospital in Afghanistan's capital on Wednesday, killing at least four people and wounding more than 60, setting off clashes with security forces that were still underway hours later. (AP Photo/Rahmat Gul)
The Associated Press
A patient's relative cries near the biggest military hospital after clashes between insurgent fighters and security forces ended, in Kabul, Afghanistan, Wednesday, March 8, 2017. Afghanistan's Defense Ministry says an attack on a military hospital in the capital has killed more than 30 people. (AP Photos/Massoud Hossaini)
The Associated Press