At least 29 people were killed and more than 80 others wounded in the suicide attack on a Shia mosque in Paktia province, in eastern Afghanistan, Abdullah Hasrat, spokesman for the governor of Paktia province, said.
Dr. Mohammad Wali Roshan, a physician at a local hospital, said some of the relatives, armed with sticks and guns, were furious at the lack of security and began beating medical personnel who arrived to help the wounded.
No individual or group has so far claimed responsibility behind the incident.
The sources said at least 600 people were inside the mosque when the bombing happened.
The Shia cleric said that in eastern Paktia province, where Gardez is located, the Taliban have a strong presence and have never attacked Shias in the past and have never threatened them.
"Initial reports indicate that the militants opened fire and detonated an explosive", said Sardar Vali Tabassum, a Gardez police officer.
The mosque was packed with those attending Friday prayers.
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But Daesh has carried out multiple attacks in the eastern city of Jalalabad and the capital Kabul in recent months, targeting everything from government ministries to a midwife training centre.
The Sunni extremist group has frequently targeted Afghanistan's Shi'ite minority, which IS calls "apostates".
No one claimed responsibility for the attack but the Daesh affiliate in Afghanistan has targeted Shia worshippers in the past.
Afghanistan has mostly avoided the sectarian violence that has hit countries such as Iraq, but there have been increasing numbers of attacks on Shi'ite targets in recent years.
No reliable census information exists on the size of the Shi'ite community in Afghanistan, but estimates range around 10-20 percent, with most coming from the Persian-speaking Hazara and Tajik ethnic groups.
Afghan security officials secure the roads leading to the scene of the suicide bomb blasts in Paktia.