Montgomery County police arrested a teenager Thursday, the third charged in the killing of a 20-year-old last month in Germantown, police said.

       Detectives arrested the 16-year-old on a charge of first-degree murder in the killing of Taon Lamont Cline, who was shot four times on April 22 in the Fox Chapel neighborhood, police said in a statement. The shooting stemmed from an ongoing confrontation between Germantown and Gaithersburg gangs, officials said Wednesday.

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       Earlier in the week, authorities charged a 15-year-old and a 14-year-old as adults with first-degree murder. The Washington Post generally does not name juveniles charged in crimes until they are in circuit court.

       The oldest teen charged shares a last name with the 15-year-old and is from the same Montgomery County town, but police did not outline their relationship.

       No further details were released late Thursday.