A bomb blast outside the Iranian ambassador's house in Libya's capital on Sunday which caused minor damage to the empty building was claimed by militants affiliated with the Islamic State group.

Iran's Foreign Ministry spokeswoman Marzieh Afkham condemned the ‘terrorist’ attack, which she said claimed no lives. She called on political rivals in Libya to form a national unity government to end the country's escalating chaos.

Twitter accounts used by Islamic State supporters said the attack was carried out by the group's branch in Tripoli and posted pictures from the site of the explosion. There are growing concerns that the Islamic State has spread beyond the battlefields of Iraq and Syria and established a foothold in Libya, just across the sea from Europe. There was no official statement from the group claiming responsibility for the attack.

The group claimed responsibility for suicide bombings Friday in eastern Libya that killed at least 40 people in what the group said was retaliation for Egyptian airstrikes against the extremists' aggressive new branch in North Africa.

The Sunday attack only caused minor damage to the home of the Iranian ambassador, who is out of the country, according to a Libyan security official in Tripoli, who spoke on condition of anonymity because he wasn't authorized to brief reporters.