Serving a warrant. Not clear if officers shot. One person was shot by police.
http://www.pennlive.com/news/2018/01/several_harrisburg_police_offi.html#incart_target2box_default_#incart_target2box_targeted_
The Sun (Hummelstown)1 hr ·
UPDATE: MARSHALL KILLED - Sources tell The Sun that a US Marshall was shot and killed in Harrisburg this morning executing a warrant. Reportedly, a York city police officer also shot and wounded. The suspect was reportedly killed in an exchange of gunfire.