TUNIS — The government of Tunisia said that a suicide bomber had set off the explosion on Tuesday that killed 12 members of the presidential guard in downtown Tunis and moved on Wednesday to step up security around the country.
The authorities said they had found a body at the scene that they believed was that of a suicide bomber. They also said they had found remnants of an explosives belt.
The Islamic State group on Wednesday claimed responsibility for the attack in a statement posted online.
During the day, a small crowd gathered at the end of the main boulevard here in the capital to pay respects to the dead, laying flowers, draping the national flag and standing vigil as investigators in white overalls continued to examine the crime scene.
“Everyone is shocked,” said Habiba Lamouchi, 50, a homemaker who came to pay her respects. “I am not scared — we are courageous people — but people are sad,” she said.