( CNN ) -- A gunman attacked worshippers at a Colorado Springs , Colorado , megachurch Sunday afternoon , killing one person and wounding four others before being killed by a security staff member , the city 's police chief said . Police would not discuss whether there was any connection between the church shootings and an attack on a missionary training center outside Denver about 12 hours earlier that left two people dead and two wounded . The gunman in that incident was still unknown . Chief Richard Myers called the Colorado Springs church security staffer `` a courageous security staff member who probably saved many lives . '' He said some of the shooting victims being treated at the hospital have life-threatening injuries . Several `` suspicious devices '' were found at the church , Myers said . SWAT teams were clearing the multiple buildings at New Life Church , along with an explosives unit , he said . Rev . Brady Boyd , senior pastor of New Life Church , said the church had a security plan in place . `` I 'm proud of the way our team responded , '' he said . `` Many , many lives were saved because of the quick action of some committed volunteers at our church . '' Watch as a church member describes what he saw » . He said about 7,000 people were at the church , which had just completed a late-morning service , when the shooting took place shortly after 1 p.m . The wounded were taken to Penrose-St. Francis Hospital , where two were in critical condition , Howard said . Another patient was in good condition and one fair , hospital spokeswoman Amy Sufak said . Police know neither the motive for the attack nor of any relationship between the suspect and the victims . Police spokesman Lt. Fletcher Howard said area businesses were placed on lockdown after the shooting `` to make sure there 's not any other suspects at large . '' As of Sunday afternoon there was no known connection between the two Colorado shootings , Howard said , but he did not rule out that possibility . Arvada , site of the missionary training center , and Colorado Springs are about 80 miles apart . Howard said investigators are expecting detectives from Arvada to come to Colorado Springs to check for any connections between the two cases . In Arvada , police said they were investigating whether there was any link between the two fatal shootings . `` Obviously , two shootings at two faith-based locations is very concerning to both us and Colorado Springs , '' said Deputy Police Chief Gary Creager . New Life Church is on the northwestern outskirts of Colorado Springs , near the U.S. Air Force Academy . The non-denominational church claims a membership of more than 10,000 . The church was founded by the Rev . Ted Haggard , an evangelical Christian leader who was ousted in 2006 after allegations that he had been a client of a male prostitute from whom he had purchased drugs . Haggard admitted to undisclosed `` sexual immorality '' and called himself `` a deceiver and a liar '' in a letter to the congregation . E-mail to a friend . CNN 's Eric Marrapodi contributed to this report .
Three victims at church ; two of them in critical condition . First and second victim dead . Shooter was killed by church ` ` and staff member , '' police say . Gunman fired on worshippers at Colorado Springs church , minister says .