9 injured, 4 missing as boats collide on Colorado River in California originally appeared on abcnews.go.com 
 
 Four people are missing and nine people are injured, two critically, after two private boats collided on the Colorado River in southeast California on Saturday night. Sixteen people in total were involved in the crash. 
 
 Two people were airlifted to University Medical Center of Southern Nevada with life-threatening injuries, the Mohave County Sheriff said in a press conference on Sunday evening. Water and shoreline searches continue in addition to dive operations, with a search area an estimated 2 miles in circumference. The sheriff's office added that no one on either boat was wearing a life jacket. 
 
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 PHOTO: Units from the Mohave County Sheriff's Office Division of Boating Safety photographed on Sept. 2, 2018, the day after a boating crash on the Colorado River. (Mohave County Sheriff's Office) More 
 
 The two vessels collided head on at about 8 p.m. local time between Pirate Cove and the Topock Marina, north of Lake Havasu near the Moabi Regional Park, a recreational area on the Colorado River which forms the boundary between California and Arizona. The southern tip of Nevada is about 30 miles north of the park. 
 
 @sbcountysheriff Aviation 40King6 continuing the search of the Colorado River in the air as the dive team continues underwater searches. @CORiverStation pic.twitter.com/uw3ed701LF — San Bernardino County Sheriff (@sbcountysheriff) September 2, 2018 
 
 During the collision, everyone from both boats was thrown into the water, and both boats sank. Several people were pulled from the water by other passing boaters. 
 
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 PHOTO: Law enforcement responds to a boating crash on the Colorado River, Sept. 2, 2018. Two vessels collided the night before. (San Bernardino County Sheriff) More 
 
 Officials called off the search for missing survivors around 9 p.m. last night. Dive and search operations in the area of the crash are being conducted by the Mohave County Sheriff's Office with the assistance of the San Bernardino County Sheriff's Department. 
 
 The accident happened after sunset, making rescue efforts difficult, authorities said. Some people were found as much as a mile down river due to the rapidly moving water. 
 
 Officials are unsure if alcohol was involved, or the ages or genders of those who were injured. ||||| MOABI REGIONAL PARK, Calif. (AP) — The Latest on a boat collision on the Colorado River (all times local): 
 
 10:03 a.m. 
 
 Authorities say four people are missing after two boats crashed on the Colorado River, ejecting more than a dozen people who were on board. 
 
 The Mohave County Sheriff's Office said Sunday that a boat carrying 10 people and another vessel with six people on board collided head-on Saturday night on the river that borders California and Arizona. 
 
 Authorities say both boats sank and passing boaters pulled victims from the water. 
 
 One person was found in critical condition and flown to a hospital in Las Vegas. Nine others were taken to local hospitals by ambulance. 
 
 Authorities are searching for four people who remain missing. 
 
 Anita Mortensen, a spokeswoman for the Mohave County Sheriff's Office, says none of the boaters were wearing life vests when the collision occurred. 
 
 ___ 
 
 12:32 a.m. 
 
 At least 13 people have been injured and two others are missing after two recreational boats collided on the Colorado River near the California border with Arizona. 
 
 Eric Sherwin, spokesman for the San Bernardino County Fire District, says the vessels collided head-on Saturday evening. The force of the crash caused one of the boats to sink and the other sustained heavy damage. 
 
 He says two people are missing and "presumed submerged." The search for them has been postponed because of darkness. 
 
 Sherwin says one person has life-threatening injuries and was transported to a hospital in Las Vegas. A dozen others were injured but not seriously. 
 
 The crash happened in Moabi Regional Park, a popular water recreation area along the border about 290 miles (467 kilometers) east of Los Angeles.
– Four people are missing after two boats crashed on the Colorado River, reports the AP, ejecting more than a dozen people who were on board. The Mohave County Sheriff's Office said Sunday that a boat carrying 10 people and another vessel with six people on board collided head-on after dark Saturday night on the river that borders California and Arizona. Authorities say both boats sank, throwing everyone aboard into the water; passing boaters helped pull victims from the water, though the search had to be called off at 9pm local time. It resumed early Monday. One person was found in critical condition and flown to a hospital in Las Vegas. Nine others were taken to local hospitals by ambulance. Authorities are searching for four people who remain missing. Anita Mortensen, a spokeswoman for the Mohave County Sheriff's Office, says none of the boaters were wearing life vests when the collision occurred. The crash happened in Moabi Regional Park, a popular water recreation area along the border about 290 miles east of Los Angeles. The area was packed with people celebrating ahead of Labor Day, notes ABC News.