BEIRUT — An international aid agency has warned that Syrian forces are targeting medical workers and patients who were wounded in the conflict which entered its 15th month Tuesday, forcing doctors to scramble to help the injured in makeshift clinics.

Medecins Sans Frontieres, or Doctors Without Borders, which is not authorized to work in Syria, sent teams into the country secretly. They reached the rebellious areas of Homs and Idlib, where they found patients and doctors at risk of attack and arrest.

“Being caught with patients is like being caught with a weapon,” the group quoted an orthopedic surgeon as saying in an Idlib village. “The atmosphere in most medical facilities is extremely tense; health care workers send wounded patients home and provide only first aid so that facilities can be evacuated quickly in the event of a military operation.” Homs and Idlib have been among the hardest hit regions. — Agencies