MH370 relatives find possible debris

Family members of MH370 passengers have found a possible piece of the missing Boeing 777 on an Isle St Marie beach off Madagascar's east coast.

Relatives of MH370 passengers say they've found a possible piece of debris of the missing plane. (AAP)

Relatives of MH370 passengers say they've found a possible piece of the missing Malaysia Airlines plane on an island off the east coast of Madagascar.

The group, representing the association for families of passengers and crew, Voice370, tweeted the item was found on Riake Beach, Isle St Marie, and was the first piece found by next-of-kin.

"Mixed feelings for all of us," they wrote.