Updated

The Latest on a teenage brother and sister shot and killed in an argument over a shirt. (all times local):

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6 p.m.

Police say they have arrested a man accused of fatally shooting a teenage brother and sister in a fight that started over a shirt in Midvale.

Lt. Lex Bell of Salt Lake City's Unified Police said Thursday evening that the suspect in his 30s was arrested at a house in Salt Lake County.

His name wasn't immediately released.

Bell says more arrests could follow in the Wednesday deaths of 15-year-old Abril and 16-year-old Jose Izazaga.

Police say the argument started after a man showed up at an apartment complex with a group of people and accused her of taking the shirt.

When they started pushing the girl, her brother came out to defend her with a knife. Police say both siblings were shot by a second person in the group.

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9 a.m.

Police say a teenage brother and sister were shot and killed in an argument that started over a T-shirt.

Unified Police Lt. Lex Bell says a group of people came over to the Midvale apartment complex where 15-year-old Abril Izazaga lived to confront her in a conflict over the shirt late Wednesday.

Bell says they started pushing her around and her 16-year-old brother Jose Izazaga came out to defend her with a kitchen knife or pocket knife.

Police say someone in the group opened fire, killing the girl at the scene and fatally wounding her brother.

The male who initially came over to start the confrontation has since turned himself in, but police are still searching for the person who pulled the trigger on the fatal shots.