"In what world do we live in, where children and pregnant women being treated by doctors are subject to people throwing stones at them?" questioned Marco Sandrone, MSF's Lesbos field coordinator.
"It's the perfect space for a situation to become catastrophic," said Apostolos Veizis, the director of MSF's medical operational support unit in Greece.
Médecins Sans Frontières said "indiscriminate" assault have left the medical system at a breaking point.
The worsening situation at makeshift camps in Idlib province comes as Russian-led airstrikes saw at least 18 people killed on Tuesday.
"It's also why they burn tires all the time," said Steve Gumaer, the CEO of Christian nonprofit Partners Relief & Development.
"What we are seeing are the humanitarian consequences of the tightening of migration policies," said MSF Mexico General Coordinator Sergio Martín.
"We are calling...for the emergency relocation of the most vulnerable," Médecins Sans Frontières Head Of Mission in Greece Tommaso Santo said.
"It is deeply concerning to MSF that these cases are being brushed aside as lies despite repeated warnings from MSF and other organizations," Louise Roland-Gosselin said.
At least 42 people were killed when a U.S. gunship attacked the MSF hospital in northern Afghanistan.
Violence erupted between youths from two rival ethnic groups in the camp.
Aid group says that up to 40 percent of the victims were women and children.
Bashar Ja'afari said the organisation operated in Idlib without Syria's permission
A Kremlin spokesman alleged that the U.S. may have been behind the strikes.
The aid group says that at least eight members of staff are missing after four strikes on the complex.
The medical organization recommends major policy changes in 2016.
By the end of 2015 it was attacks not by militias, but by state militaries that increased.
The IOM estimates around 3,500 refugees have died while crossing the Mediterranean so far this year
Staff confirmed there were no armed combatants in the hospital before or after the airstrikes.
The medical charity says that patients and workers were present in the hospital.
Nearly 8,000 people have been killed since last year in the violence in Ukraine.
The Defense Department said the tank in question was Afghan, but the vehicle was transporting U.S. personnel.
The airstrike killed 22 people, including patients and aid workers.
Dozens of bombs are falling every night in Yemen, making life near impossible.