A French aid worker kidnapped in northern Yemen in April by armed men has been released and is in good health, according to the International Committee of the Red Cross (ICRC).

A brief statement by the group said: "Benjamin Malbrancke, the delegate of the International Committee of the Red Cross abducted on 21 April by armed individuals near the town of Hodeida, in northern Yemen, is free".

ICRC spokesman Hicham Hassan said: "He (Malbrancke) was handed over to ICRC representatives by Ansar al-Sharia on Friday. We don't know who the abductors were."

In June, a Yemeni employee of the ICRC was killed by an air strike in Abyan province.

A local official told the news agency Reuters that the Yemeni air force had conducted the strike that killed the aid worker who he said had been trying to contact al Qaeda militants in order to negotiate the release of his French colleague.