Michael Paul Brown, the suspect accused by police of opening fire inside a Montana bar and killing four people has been taken into custody, PEOPLE can confirm. According to sources with knowledge of the situation, Brown was taken into custody behind The Ranch Bar just west of Anaconda on Highway 1.

State authorities have not said what sparked last week’s shooting, which left a female bartender and three male patrons dead. The victims were identified as Nancy Lauretta Kelley, 64; Daniel Edwin Baillie, 59; David Allen Leach, 70; and Tony Wayne Palm, 74.