DALLAS (AP) — Two members of gang of fugitives accused of killing a police officer after they escaped from prison were spotted at a bank in San Marcos, local police said Friday.

State investigators, however, said the sighting was unconfirmed.

San Marcos Police Chief Stephen Griffith said witnesses twice identified two of the fugitives as being at the bank in his city, 35 miles northeast of San Antonio.

"It is our belief at this point and time, based on witness identification of two sets of photos, that we have an accurate sighting," he said. "We believe there was a bank casing going on."

But Texas Department of Criminal Justice spokesman Larry Todd wouldn't confirm the sighting.

"We've had simultaneous sightings in San Marcos, Texas, Durango, Colorado, a small town in southern Oklahoma and someplace in Louisiana," Todd told reporters in Austin.

Police were analyzing security camera footage and possible fingerprints, Griffith said. Officers are on high alert, he said, and SWAT teams were on standby.

The seven convicts — two killers, two armed robbers, a child abuser, a serial rapist and a burglar — broke out from the state prison at Kenedy on Dec. 13 by stealing clothing from staff members and bluffing their way to the rear gate, authorities said. The group is accused of pulling off a Christmas Eve holdup at a sporting goods store in Irving in which a police officer was slain. Officer Aubrey Hawkins was shot 11 times — six times in the head — and was also run over by a vehicle.

Todd would not say if security cameras at the San Marcos bank showed anything suspicious.

"We are trying not to panic the public, but certainly to advise them of the potential danger," he said.

More than 1,200 leads have been received since the escape, and each lead must be investigated, Todd said.

The Irving Police Department released updated sketches Friday to reflect the fugitives' appearances at the time of the escape.

Police said they had reason to believe two of the suspects were injured. Irving Police spokesman David Tull said tests of blood found in the car used in the gang's escape from the sporting goods store found blood from three sources, including the slain officer.