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A man fired more than 100 rounds at sheriff's deputies early Sunday, killing one and injuring four others, before being fatally shot himself in what authorities called an ambush. Two civilians were also injured.A law enforcement official told The Associated Press that Matthew Riehl was the suspect who shot the five deputies and two civilians as the officers responded to a complaint at the apartment in Douglas County. The official had been briefed on the investigation but spoke on condition of anonymity because he was not authorized to discuss the case publicly.A YouTube user identified as Matthew Riehl posted a YouTube video Dec. 13 calling for the firing of Douglas County Sheriff Tony Spurlock and railing against him in highly personal terms. Riehl wears an Iraq combat veteran hat in the post; a National Guard spokeswoman told KUSA-TV that Riehl served briefly in Iraq.Riehl said in his Dec. 13 YouTube video, called “Fire Sheriff Spurlock,” that he would run as a libertarian, ending with holiday greetings and a vow to “fire all these bums come early next year.”Riehl is vague about his political beliefs and personal grievances, though his animosity clearly ran deep. He flashes the business card of an officer who, he says, shows up at homes after sunset with an attractive woman and “will then ambush you from behind the door.”A video posted on Nov. 28 shows a traffic stop by a police officer in the city of Lone Tree — apparently taken inside the officer’s car — that Riehl said was done illegally. He alleges the officer clocked the wrong driver, identifying the officer by name in the video and calling him “dirty.”“Scumbag, dirtbag, liar,” he says as the officer questions the driver. “He’s the boss, huh? He’s the Nazi in charge with the stripes on his shoulder and the fake badge.”The sheriff did not release any details about the weapons and ammunition used except to say the suspect had a rifle. He also did not know if law enforcement had any prior knowledge of firearms being in the home but the possibility always weighs on deputies’ minds.The shooting occurred at a home at the Copper Canyon Apartments, a landscaped complex in Highlands Ranch, 16 miles south of Denver."I do know that all of them were shot very, very quickly. They all went down almost within seconds of each other, so it was more of an ambush-type of attack on our officers," said Douglas County Sheriff Tony Spurlock. "He knew we were coming and we obviously let him know that we were there."The wounded deputies tried to pull the fallen officer, identified as Zack Parrish, out of the line of further gunfire but were unable to because of their own injuries and to "crawl to safety," Spurlock said.Parrish, 29, a married father of two young children, had been with the department for about seven months. Spurlock called him a "good kid" who was eager to work."His wife told me today that he loved this job more than he had loved any job he ever had," the sheriff said.The four injured officers, who range in age from 28 to 41, were in stable condition, and the two civilian injuries were not life-threatening.Boulder County Sheriff Joe Pelle said his son, Douglas County sheriff's deputy Jeff Pelle, underwent surgery from injuries suffered in the attack and was recovering.President Donald Trump expressed sorrow, writing on Twitter, "My deepest condolences to the victims of the terrible shooting in Douglas County @dcsheriff, and their families. We love our police and law enforcement - God Bless them all!"