At least one person was shot dead late on Wednesday in the restive Garissa town in northern Kenya, the largest incident of insecurity to have rocked the town. Regional police commander, Charlton Mureithi said the incident happened immediately after the results for the governorship race were announced by the area Independent Electoral and Boundaries Commission (IEBC) returning officer. Mureithi was however reluctant to link the incident to the political rivalry between the two main camps but said that police had launched investigation into the matter. \"We have launched investigations to establish the cause of the death and we are also pursuing the person\'s attackers,\" Mureithi said in Garissa town. Earlier in the day, a contingent of security officers was forced to use teargas to disperse s group of rowdy supporters from the two camps. The man of Somali origin was shot in the head by a person who was on top of balcony. The incident has raised tension in Garissa town with businesses closing early. Garissa became the most unsafe town in the country following a spate of grenade and gun attacks believed to be masterminded by the Al-Shabaab militia group. The East African nation blames Al-Shabaab for a string of attacks and kidnappings in Kenya. The Kenyan government says the kidnappings threaten tourism, a key source of revenue for the country. Dozens of security officers and scores of civilians have been killed, many maimed and property worth millions were destroyed in Mandera, Wajir, Garissa, Nairobi and Mombasa since the Kenyan soldiers entered Somalia in October 2011 in bid to forestall dangers facing from threats of Al-Qaeda linked Somali group, Al- Shabaab.