Three refugees, including a child, were missing and six were injured off the island of Kos on Wednesday morning after a Coast Guard boat collided with their rubber dinghy carrying 34 people on board.
The dinghy capsized throwing all passengers into the water, state-run news agency ANA-MPA reported.
Those missing are a three year-old boy and two men aged 26 and 28, Greek media reported.
Α vessel of EU border patrol Frontex in the area rescued 31 people, while another three Greek coast guard boats, a Super Puma helicopter and a privately-owned boat joined the search and rescue effort.
Those injured were transferred to the hospital in Kos. No details were known about their health.
A Navy underwater unit was also searching the area for the missing refugees.
The Coast Guard vessel was on a regular petrol east of Kos when the incident happened.