Detectives from the PSNI's Serious Crime Branch who are investigating the murder of Kevin McGuigan have arrested a 47-year-old man in Belfast city centre today.
"The suspect has been taken to the Serious Crime Suite at Antrim Police Station for questioning," Detective Chief Inspector John McVea said.
The PSNI have now arrested 11 people in relation to the murder. One person has been charged with firearm offences.
Police believe the murder of McGuigan was due to a "fall-out" in Republican circles.
The killing has caused a political storm.
Last week, PSNI chief George Hamilton said elements of the IRA were responsible for the murder of Mr McGuigan in Belfast.
Sinn Féin have vehemently denied the claim that the IRA is still in existence - with party president Gerry Adams making firm denials that the group is still operating.
