Belfast , Northern Ireland ( CNN ) -- Authorities in Northern Ireland have arrested a tenth person in connection with the death of a police officer in a car bombing last April , police said Wednesday . A 23-year-old woman was arrested in Omagh by detectives probing the death of Constable Ronan Kerr `` and associated incidents , '' the Police Service of Northern Ireland said . Five men were arrested Tuesday . Kerr died April 2 when an explosive device detonated under a car in the Highfield Close area of Omagh . The 25-year-old had only recently joined the service , Assistant Chief Constable Drew Harris said at the time . `` Our determination to pursue every possible line of enquiry remains undiminished , '' Detective Superintendent Raymond Murray said Tuesday . Of the 10 people arrested , only one has been charged in connection with the investigation -- though not with the killing . A 33-year-old man from Omagh was charged after arms and explosives were found in Coalisland , County Tyrone . Northern Ireland was racked by violence between pro-Irish and pro-British forces over a period of three decades . About 3,500 people were killed before a power-sharing deal known as the Good Friday Agreement was reached in 1998 . In August of that year , Omagh was the scene of the conflict 's most deadly terrorist attack , in which a car bombing by the paramilitary splinter group Real IRA killed 29 people . Journalist Peter Taggart contributed to this report .
Of 10 people arrested , only one has been charged in connection with the investigation so far . Ronan Kerr , 25 , was killed April 2 in a car bombing in Omagh . Police vow to `` pursue every possible line of enquiry ''