Saudi Arabia's foreign minister rejected an accusation by Iran's Revolutionary Guards that his country was behind twin attacks in Tehran on Wednesday that killed at least 12 people.

Suicide bombers and gunmen attacked the parliament building and the Mausoleum of Ayatollah Khomeini in the Iranian capital. Islamic State Group claimed responsibility and released a video purporting to show gunmen inside the parliament.

Speaking in Berlin, Foreign Minister Adel Al-Jubeir said there was no evidence to implicate Saudi Arabia in the attacks in Tehran, which is Riyadh's arch regional rival.

"We condemn terrorist attacks anywhere they occur and we condemn the killing of the innocent anywhere it occurs," Jubeir told an event hosted by the Konrad Adenauer Stiftung, the think- tank of Chancellor Angela Merkel's Christian Democratic Union.

He said Riyadh had no knowledge of who was responsible for the attacks, and denied that Saudi groups were behind it.

"We don’t know this. We haven’t seen the evidence," he said, repeating Riyadh's longstanding view that Iran is the primary sponsor of terrorism around the world.

Jubeir said Saudi Arabia and other Gulf countries would be willing to reestablish normal ties with Iran if it changed its behaviour and stopped supporting militants and fighters in Lebanon, Yemen, Syria and elsewhere across the region.