At least 17 people were killed and dozens injured on Friday after a suicide bomber attacked a hospital in Iraq where people injured from an earlier attack on a mosque were being treated, dpa reported.
Medical sources told the German Press Agency dpa that electricity was cut in the Tikrit city hospital after the explosion.
The suicide bomber targeted victims being treated from an attack that took place earlier Friday.
That attack itself left at least 19 people dead and 52 injured, police sources said, bringing the combined total death toll for Friday to at least 36.
The explosive device went off after weekly prayers inside the mosque in northern Iraq's city of Tikrit, targeting worshippers there.
One member of the provincial council, as well as the head of the province's family court, were among those killed in the blast outside the mosque.
A senior security official, a member of parliament and another member of the provincial council were among those injured.
The official Iraqiya television said a suicide bomber was wearing an explosive belt inside the mosque, which is located inside a compound of palaces built under the Saddam Hussein regime.
The predominantly Sunni Muslim city, located 170 kilometres north of Baghdad, was the home town of the former Iraqi leader, ousted in the US-led invasion in 2003 and later executed.
The attack came after bombings in Ramadi, the capital of the western Anbar province, killed at least six people on Thursday.
The country's top three security portfolios remain vacant owing due to disagreement between the political blocs on candidates.
Prime Minister Nuri al-Maliki has been also been acting minister of defence, interior and national security for months.
Violence in Iraq has decreased since the 2006 height of Sunni-Shiite bloodshed, but bombings and attacks continue almost daily in the different provinces of the country.