Tunisian authorities have identified a suicide bomber who targeted presidential guards in a deadly attack, saying he was a 27-year-old local street vendor.

The Interior Ministry said in a statement Thursday that forensic police identified Houssam ben Hedi ben Miled Abdelli by his DNA. It said he was from a working class neighborhood on the edge of Tunis.

The Islamic State group claimed responsibility for Tuesday's attack on a bus in central Tunis, which left 12 dead plus the attacker.

The blast shook Tunisia and its fragile young democracy after two attacks on tourist sites this year by Islamic radicals that killed 60 people.

A disgruntled Tunisian vendor set himself on fire in 2010, sparking a nationwide uprising that overthrew the president and led to revolts across the Arab world.