Abdirahman Osman says 56 people are still missing from Saturday's truck bombing on a busy street in Mogadishu.
Another 228 people were wounded. Thousands gathered at the attack site today to pray.
Somalia's government has blamed the bombing on extremist group al-Shabab, which has not commented.
Thousands of anguished Somalis have gathered to pray at the site of the country's deadliest attack and to mourn the hundreds of victims.
A sheikh leading the prayers says that "this pain will last for years." More than 300 people were killed and nearly 400 wounded in Saturday's truck bombing, with scores missing.
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Somalia's government has blamed the al-Shabab extremist group for the attack.
The US military says it carried out a drone strike this week against al-Shabab in Somalia, shortly after the extremist group was blamed for the country's deadliest attack.
The US Africa Command tells The Associated Press that the strike occurred Monday about 35 miles (56 kilometres) southwest of the capital, Mogadishu. The US says it is still assessing the results.
Saturday's truck bombing in Mogadishu killed more than 300 people and wounded nearly 400 others.
The US has carried out several drone strikes in the Horn of Africa nation since President Donald Trump approved expanded military operations against the group early this year.
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