Officials released the names of four volunteer firefighters killed in last week's deadly fertilizer plant blast in the close-knit town of West, Texas, on Sunday. Authorities have now also identified the center but not the cause of last week's deadly fatal explosion. Meanwhile, hundreds of residents of the town, known locally for its Czech heritage, sought healing at church services. Among the dead named at a news conference outside city hall in West, Texas, were brothers Doug and Robert Snokhous, remembered by their family as 'lifelong best friends' who lived half a mile from each other and worked together at an ironworks in nearby Waco. Destruction: This apartment complex near the fertilizer plant was destroyed by the explosion on Wednesday Reflection: Residents of West bow their heads in prayer during an open air Sunday church service four days after the deadly explosion Assessment: Workers stand among debris at the remains of the fertilizer plant in West,