Ukiah police on Thursday were searching for the person or persons responsible the stabbing Tuesday evening of a 41-year-old man who suffered serious wounds.

He was flown to an out-of-county hospital and is expected to survive, said Ukiah Police Capt. Justin Wyatt. He said"We don't have anybody in custody yet," about the attack. He said police think more than one person was involved in the stabbing, which occurred in the parking lot of an apartment complex on Observatory Drive in south Ukiah about 5 p.m. Tuesday, Wyatt said.

Residents of the apartment complex phoned 911 after hearing the man call for help, Wyatt said.

"Nobody saw anything. I don't think anyone was outside at the time," he said.

The victim suffered wounds to his chest, arm and hands.

Police have not released his name to ensure his safety and to preserve the integrity of the investigation, Wyatt said. Police know of the man from previous law enforcement contacts, Wyatt said.

The 20 most common ailments that caused patients to be admitted for treatment at Sonoma County hospitals last year were reported by the Office of Statewide Health Planning and Development:

1. Major joint replacement 1,953
2. Septicemia 1,934
3. Esophagitis, gastroenteritis and miscellaneous digestive disorders 712
4. Pneumonia 709
5. Heart failure 609
6. Gastrointestinal hemorrhage 537
7. Bowel procedures 480
8. Intracranial (brain) hemorrhage 475
9. Appendectomy 467
10. Cervical, spinal fusion 462
11. Cholecystectomy (gall bladder removal) 460
12. Myocardial infarction 431
13. Renal failure 424
14. Cardiac arrhythmia 420
15. Cellulitis (tissue infection) 419
16. Gastrointestinal obstruction 365
17. Kidney and urinary tract infections 361
18. Uterus, ovary and fallopian tube procedures 328
19. Lower extremity and humerus procedures except hip, foot, femur 311
20. Pulmonary edema 307

The Office of Statewide Health Planning and Development data for California counties is available at