DALLAS -

A Miami-Dade police detective called 911 after he was stabbed in the parking lot of a Walmart in Grapevine, Texas, while transporting a convicted sex offender to Las Vegas.

Jaime Pardinas, 54, remained hospitalized at Parkland Memorial Hospital in Dallas on Wednesday after undergoing surgery. He is talking and is expected recover, Miami-Dade police Sgt. Patricia Bimonte.

Police say Alberto Morales, 42, stabbed Pardinas four times while they stopped at the Walmart so another detective, David Carrero, could use the restroom.

"Where's the guy that stabbed you?" asked the operator.

"He ran," answered Pardinas.

"Where'd he go?" said the operator.

"I can't tell you," said Pardinas. "I've been stabbed in the neck. Subject is 5 feet 7 inches, 165 pounds, white Latin male named Alberto Morales. He's a schizophrenic."

LISTEN: Pardinas' 911 call (Warning: Contains graphic content) | 911 call |

Pardinas was heard breathing heavily throughout the call.

On another 911 call, a bystander told the operator: "There's a guy with a gun and somebody on the floor bleeding." The caller than clarified that "the guy with the gun is helping the guy that's bleeding."

Grapevine police spokesman Robert Eberling said authorities continue to search near the airport and will do so until they believe they should look elsewhere. He said the search covers "any place anybody can hide," including yards and drainage ditches.

Alberto Morales

Eberling said inmates who knew Morales in prison have told investigators that he had vowed not to return.

"He's made it pretty clear that he's not going back to prison," Eberling said. "He may have been planning this for sometime."

Eberling said Morales was able to escape even though he was shackled "appropriately," wearing handcuffs and a chain to prevent him from moving his arms.

More detectives from Miami-Dade are expected to come to Dallas to help with the search that already involves the U.S. Marshal's Service, authorities at the U.S.-Mexico border and law enforcement officials from Miami and Nevada, Eberling said.

Bimonte said up to 10 officers from Miami-Dade are expected to be in Dallas on Wednesday.

"We need to find this guy. I can't imagine that he has been able to get out of here. He's in a pair of shorts, he's in a T-shirt, he's got one shoe," said Bimonte.

Police initially thought Morales might be in a vehicle stolen Tuesday morning at a motel near the airport, but Eberling said Wednesday that's not the case. He said the vehicle has been recovered in Dallas and is not believed to be connected to the incident.

The Texas Dept. of Public Safety is offering a $10,000 for information leading to Morales' arrest. Chris Heisler with the Honor Network said the reward would likely be increased.

Flyer

Police there say they are looking for Morales near train tracks in Grapevine, Texas. An alert has been issued for all nearby communities to look for the suspect, who is likely still in shackles.

"Until we have information that leads us to believe that he left this area, we're still looking in the immediate area of Grapevine to try to locate Mr. Morales," said Eberling. "We have not recovered any clothing, any of the shackles that were restraining him. We're still searching the area to see if we can recover any of that."

U.S. Marshals and U.S. Customs and Border Protection agents are assisting with the searching.

Police say Morales has charges dating back to 1994.