Emilio Navaira is showing signs of improvement, including opening his eyes and moving his limbs, days after being severely injured when his tour bus crashed, his neurosurgeon said, reported Associated Press

Navaira had been in a coma since the accident. Now he is slowly regaining consciousness. He moved his arms and legs Wednesday evening, said Dr. Alex Valadka, with Memorial Hermann-Texas Medical Center.

Doctors cautioned that Navaira remains in critical condition.

Recovery from the type of neurological injuries Navaira has suffered often takes months or years, he said.

Navaira, a father of five, is known to his fans simply as Emilio.                                                                    

The 45-year-old singer was behind the wheel of his tour bus early Sunday morning when it slammed into a collection of freeway barrels that mark the interchange of Interstate 610 and U.S. Highway 59 in Bellaire, a southwest Houston enclave.

The bus accident remains under investigation, said Bellaire Assistant Police Chief Byron Holloway.

Investigators are still waiting for results of blood-alcohol tests. Police are also looking at whether Navaira might have fallen asleep.