Commercial Fixed Wing
Flight Deck / Cabin / Aircraft Event Illness / Injury; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Air Traffic Control Provided Assistance; Flight Crew Returned To Departure Airport
Aircraft
The aircraft took off from ZZZ. [As] we passed 10;000 feet; I started tasting something like metal in my mouth about this time the flight deck called and said we were turning around to go back to ZZZ because they smell something unknown and they had to don the oxygen mask. By this time; the crew was starting to get some symptoms; we took our jump seats and landed back in ZZZ. The aircraft was met by EMTs and airport police. They took us to different emergency rooms. At the emergency room; they gave me oxygen and did the carbon monoxide test.
Flight Attendant reported unknown odor during climb. Simultaneously; the Captain reported a return to departure airport due to unknown odor.