Angry Shiite mourners on Tuesday accused the government of failing to provide protection as they buried loved ones
A massive suicide blast claimed by the Islamic State group targeted a Shiite congregation in Kabul on Monday, killing at least 27 people and wounding 64.
"ISIS has stepped up its horrific and unlawful attacks on Shia public gatherings, making no place safe," Patricia Gossman, a senior researcher at Human Rights Watch, said in a statement using an alternative acronym for IS.
"The government, Shia leaders, and civil society groups should work together to develop appropriate ways to improve security during vulnerable public and religious gatherings so that Shia community members can exercise their basic rights." she said.
Amnesty International, in a statement Monday, said Afghan authorities "have a duty to take effective measures to protect Shia Muslims from attacks and end impunity for previous abuses against the Shia community".
The latest attack was mounted as worshippers gathered for the major Shiite ceremony of Arbaeen, marking the end of a 40-day mourning period after Ashura.
Ashura itself commemorates the death of Imam Hussein, the grandson of the Prophet Muhammad.
Angry Shiite mourners on Tuesday accused the government of failing to provide protection as they buried loved ones.
"We voted for this government, people's fingers were cut by militants for voting. In return the government should provide us with security," said Ghulam Haydar, a relative of a victim.
"I want the the international community to help us get rid of the terrorists and stop them from harming the people."
The interior ministry said it had suspended four police officials in connection with the attack and launched a thorough investigation.
Last month a powerful blast targeting Shiites during Ashura killed 14 people in northern Afghanistan. It followed twin attacks claimed by IS that also targeted Shiites and killed 18 in Kabul.
In July IS jihadists claimed twin explosions that ripped through crowds of Shiite Hazaras in Kabul, killing at least 85 and wounding more than 400.
Those bombings marked the deadliest single attack in the Afghan capital since the Taliban were ousted from power in a 2001 US-led invasion.
Fighters from IS, which controls territory across Syria and Iraq, have been making steady inroads in Afghanistan, challenging the Taliban on their own turf -- mainly in the east.