An apparent suicide attack in Iraq has left at least 25 people dead and injured more than 30 others.
The bombing is reported to have targeted a Kurdish funeral in the northern town of Talafar, near Mosul.
Earlier, at least five policemen and four civilians were killed in two separate attacks in Baghdad.
In another development, Iraqi police said they had arrested several men over the kidnapping and killing of British aid worker Margaret Hassan.
Details of the attack in northern Iraq are still sketchy, but local officials say a suicide car bomber drove into mourners attending the funeral of a Kurdish official.
The official, Taleb Wahab, was a member of the Kurdistan Democratic Party. He was killed by insurgents in Mosul on Saturday.
Reports say gunmen then blocked the road, attacking US troops, Iraqi police and ambulances who were trying to reach the scene of Sunday's suicide bombing.
In the latest spate of attacks in Iraq since Friday, some 90 people have been killed.
Correspondents say insurgent activity has intensified in the past two weeks, as Iraq's leaders struggle to complete the formation of a new government.
An incomplete cabinet was installed on Thursday, but key ministries, including defence, remain vacant.
In the Hassan case, in addition to the arrests, police said they had found documents, clothing and a handbag belonging to the Dublin-born director of Care International in Iraq, who was abducted on 19 October 2004.
A video showing her apparent death was released a month later but her body has never been recovered.
News of the arrests came as a video was released on Sunday showing an Australian citizen believed to have been kidnapped in Iraq.
On the tape, the man identifies himself as Douglas Wood, saying he is 63 and lives in the US.