Ten officers from the Aurora Police Department, two Lakewood Police officers, six Denver Police officers and three Parker Police Honor Guard members are already in Dallas.
Sgt. Smith, 55, was one of five officers gunned down in an ambush on law enforcement a week ago in downtown Dallas.
"When the gunfire started, the demonstrators ran for cover while the Dallas police officer ran to the fire", Sciullo said.
Memorial services were held Wednesday for three of the Dallas police officers slain by a sniper at a Black Lives Matter protest last week, with each man solemnly saluted for his courage and ultimate sacrifice.
Police officers in their formal attire visited the memorial held at The Potter's House, a popular church whose clergy's main authority is Bishop T.D. Jakes.
Ahrens' funeral will be held in Plano.
On Wednesday Smith's family and friends gathered for a funeral mass at Mary Immaculate Catholic Church in Farmers Branch, where he was a parishioner.
Mike Smith, a 25-year-veteran of the Dallas Police Department, will be laid to rest on Thursday, at the Watermark Community Church, in north Dallas, where he worked an extra job as a security guard.
DART Officer Brent Thompson was killed during an ambush in downtown Dallas
The funerals for officers Michael Krol and Patrick Zamarripa have been scheduled for the weekend.
Coverage of the service for DPD officer Senior Cpl. "We can not explain it", he said.
Thompson's wife Emily, a fellow DART officer whom he had recently married, told the audience that the shooter, Micah Johnson, was a coward. He once received a "Cops' Cop" award from the Dallas Police Association. Officials had to block off streets while they searched for weapons or bombs.Sam Eichenwald for NewsweekAn officer speaks with a civilian who was handing out glowing blue wristbands meant as a sign of support for the Dallas police.
Smith was an Army Ranger before joining the Dallas police force in 1989. The 6-foot-5, 300-pound cop was remembered as a "supersized can of kick ass" by one of his colleagues.
During the funeral service at the cavernous Prestonwood Baptist Church in Plano, Texas, fellow officer Debbie Taylor described Ahrens, 48, as a "gentle giant" who "strived to be the best, most knowledgeable officer".
His daughter delivered an emotional farewell to her father.
The funerals came a day after President Barack Obama praised the slain officers' heroism, condemned the attack as an "act not just of demented violence but of racial hatred" and made an impassioned plea for national unity.