Rescue teams working through the night were able to provide supplies of oxygen, as well as food and water, to some of those trapped through gaps in the rubble from a Shia Muslim shrine, local media reports.
The assailant, identified as a foreign national, was arrested along with four suspected accomplices in Iran's Mashhad city.
But the militant group's opponents have warned that the move can invite US sanctions on a country that's already reeling under an economic crisis.
The mass sentencing was "the largest single incident" since the government began stripping opponents of their citizenship rights in 2012, a rights group said.
Supporters continue to gather in support of top cleric Ayatollah Sheikh Isa Qassim after the kingdom stripped him of his nationality.
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