Twin bombings at a sports club in Kabul on Wednesday killed at least 20 people, including two journalists, and wounded 70 others.
Two journalists - a reporter and cameraman - working for local Tolo News, were among the dead and others were wounded in the attack.
Writing on Twitter on Wednesday, the head of Tolo, Lotfullah Najafizada, paid tribute to Samim Faramarz, 28, and Ramiz Ahmadi, 23, who he described as "two of our best journalists".
Saad Mohseni, the head of MOBY Group, which Tolo News is part of, described the journalists as "young, fearless and thoughtful" in a Twitter post.
No immediate claim of responsibility was made for the blasts in Dasht-e-Barchi, home to many members of the mainly Shia Muslim Hazara ethnic minority that has been targeted in the past by members of Islamic State of Iraq and the Levant (ISIL).
Images taken at the scene showed young men in torn wrestling kit helping the wounded onto vehicles to be taken to hospital.
The first explosion was triggered by a suicide bomber and was followed by a car bomb shortly after, said interior ministry spokesman Najib Danish.
Afghan President Ashraf Ghani condemned the bombings. "An attack on civilians and media workers of the country is an attack on freedom of speech and crime against humanity," he said in a statement.
A reporter and cameraman from Afghanistan's largest broadcaster, Tolo News, were killed in the second blast and four other local television crew were wounded, according to NAI, a group supporting open media in Afghanistan.
Kabul police spokesman Hashmat Stanekzai said the second explosion hit as police were helping victims and a number of officers were wounded.
Al Jazeera's Jennifer Glasse, reporting from Kabul, said the second bomb appeared to target first responders and journalists.
"It has been a very deadly year here for journalists and for Afghans alike," Glasse said.
On April 30, twin explosions in Kabul killed nine media workers and 16 other people.
'A lot of dead'
Social media users who purportedly witnessed the attack said the bomber killed the guards at the club before blowing himself up inside.
He "detonated inside where a large number of athletes had gathered. There are a lot of dead and wounded", Mohammad Hanif said on Facebook.
Wednesday's attack underlined the danger in Kabul as elections approach next month, as well as the threat facing the Hazaras - a Persian-speaking minority that has long faced discrimination.
In mid-August, at least 34 people were killed in a suicide attack in front of an education centre in Dasht-e-Barchi, west of Kabul.
ISIL - which has established a brutal reputation and which both the Western-backed government and the Taliban consider an enemy - claimed responsibility for that bombing.