Transcript for Manhunt for gunmen wanted in deadly shooting at watch party
And now to the search under way at this hour. The other deadly shooting we're following tonight. And that urgent manhunt playing out right now in California. Families and their children were gathered to watch Sunday night football when two gunmen got onto the property and began firing. At least four were killed. Several more shot. Mothers and their children grieving tonight. And in that California community and beyond, they are searching for the suspects. Matt Gutman is there tonight. Reporter: Tonight, an all-out manhunt for a hit squad that filled this Fresno street with gurneys. All units responding. They may be having multiple victimcome in. We need ems out to the back. Reporter: A group of 30 family and friends watching ten people were shot, four of them would die. They came through an unlocked gate. They walked into the backyard and began immediately firing into crowd. Reporter: Police say the group in the backyard of that watch party were unaware they were about to be gunned down. We're going to need more ems ambulances out here. Four more are in route. Reporter: Police say the two gunmen were reportedly armed with semiautomatic pistols. And there were so many victims that every first responder in Fresno was called out. Inside the house itself, about 20 others, including women and children. Thankfully, the children were inside the house at the time, but they could have just as easily been injured or killed. Reporter: What the gunmen left behind was grisly and traumatizing. I had two of my officers that were covered in blood and actually had to be decontaminated. Reporter: Police say it appears to have been a targeted attack in the community predominated by southeast Asians, but that no one at the party seemed to have gang affiliations. We're coming for you. This is not going to be tolerated. Reporter: David, now, the surviving victims have told police they could not identify that pair of shooters because all they saw were those muzzle flashes. Now, police have been going door-to-door looking for eyewitnesses or even surveillance video that could help identify those killers. So far, no leads. David? Matt Gutman on this story all day for us.
This transcript has been automatically generated and may not be 100% accurate.