Teenage brothers charged in a drug-related shooting that left two people dead and three wounded at a Seattle homeless camp have pleaded not guilty to murder charges.

The two boys, ages 16 and 17, each entered their pleas on murder and assault charges Thursday at the Maleng Regional Justice Center in Kent.

They have been charged as adults in the killings that took place Jan. 26 at a longstanding encampment known as the Jungle, about a mile from downtown.

Their 13-year-old brother pleaded innocent to the same charges in juvenile court last week. All three remain in jail.

Police believe the shooting stemmed from a low-level drug deal and that the suspects and victims knew of each other.

The Associated Press typically does not name minors accused of crimes.