Two days of heavy storms and flooding killed five people in Central Texas, and at least two other people remained missing Friday, officials said.

Several other people were plucked from rising waters, and Gov. Rick Perry activated state search and rescue teams as heavy storms were expected to pound the region over the long holiday weekend.

Police said three people died in Killeen, including a 5-year-old boy and his 6-year-old brother who were found early Friday in a submerged sport utility vehicle. The boys were riding with their mother and two siblings when their vehicle was wiped off the roadway and into a gully Thursday.

Rescuers saved the mother and two siblings, but the swift-moving water rose so quickly that rescuers couldn't help the boys trapped inside, said Bell County Justice of the Peace Garland Potvin. Javiante Tarrance, 6, and brother Jarvis, 5, had just graduated kindergarten.

Elsewhere in Killeen, police said 20-year-old Sean Cannon was walking with another person when he was caught in rushing water. His body was found lodged along a culvert and the other person was rescued, Potvin said.

Outside Copperas Cove, a husband and wife driving home died late Thursday after attempting to cross flood waters, said Coryell County Justice of the Peace Bill Price.

Authorities were still searching Friday near Fredericksburg for Edgar Garcia, who was washed away in his SUV during a storm that dumped 5 to 10 inches of rain in the Texas Hill Country since Thursday.

Lt. Jim Judd of the Gillespie County sheriff's office said about 30 people spent Friday looking for Garcia, who called his mother after he drove around a barricade blocking a swollen creek and got stuck.

Judd couldn't say whether Garcia could have survived being swept away, but "the longer this goes the less likely we are to find him alive."

Another person remains missing in Killeen, Potvin said.

Other vehicles were also washed away, but no other deaths were reported in the county, Judd said. He said people were rescued from three other vehicles and a tractor-trailer.

Emergency responders performed about 20 vehicle rescues in Killeen, and Fort Hood personnel reported 12 water rescues at the post.

Oncor Electric Delivery reported about 3,000 homes without power in the Central Texas area. There were about 2,000 outages around Dallas and Fort Worth.

In Schleicher County, three people trapped between two water crossings were rescued by helicopter. They were not injured, according a report from the Governor's Division of Emergency Management.

Perry activated 96 soldiers and 38 vehicles to be deployed in Waco, Austin and San Antonio for the weekend. He also activated four Texas Army National Guard helicopters and 28 other personnel, to be staged in Austin and San Antonio.

Three helicopter rescue squads from the Texas Task Force 1 search and rescue team were also activated. The task force also will support a 28-member swift water rescue team in San Antonio with equipment and personnel ready for rapid deployment.

Perry and other officials urged caution throughout the stormy Memorial Day weekend.

Heavy rainfall caused rivers and creeks to swell. Although some floodwaters started receding Friday, another round of heavy rain was expected over the weekend, said meteorologist David Schumacher of the National Weather Service in New Braunfels.

"We're going to be in a wet pattern for the next few days," said Ted Ryan, a meteorologist with the National Weather Service in Fort Worth. "There's probably going to be lots of flooding issues."