Egypt condemned "in the strongest terms" Wednesday's twin terrorist attacks in Iran that killed at least 12 people and injured more than 40, the foreign ministry said.

On Wednesday, assailants armed with Kalashnikov rifles stormed the Iranian parliament building in Teheran. One of the attackers blew himself up inside, where a session had been in progress. Another group of attackers, including a second suicide bomber, struck former leader Ayatollah Khomeini's shrine.

In a statement on Thursday, Cairo called on the international community to increase efforts to fight terrorism and weaken its sources of support.

The Islamic State (IS) group, known as Daesh, its Arabic acronym, claimed the attacks, its first ever carried out in Iran.