BOGOTA, Feb. 2 (Xinhua) -- The Revolutionary Armed Forces of Colombia (FARC) has suspended the release of two hostages due to disputed military flights over the area, the International Committee of the Red Cross (ICRC) said Monday.

Yves Heller, an ICRC spokesman in Colombia, said Colombian military flights over Villavicencio, where the hostages would be released, "produced tension."

The military planes flew over the zone at a height of over 20,000 feet (6,600 meters), said writer-journalist Jorge Enrique Botero, a member of the humanitarian mission.

The two hostages awaiting release are Alan Jara, a former governor abducted in 2001, and Sigifredo Lopez, a former provincial lawmaker kidnapped in 2002.

The Colombian government has announced the suspension of air force flights for the ICRC release operation, promising that "(flights) will only be sent as requested" by the humanitarian mission "in case of emergency."

Heller said the ICRC will keep its promise of assisting any humanitarian mission to receive hostages.

Sources said it is possible for the FARC to releases the two hostages on Tuesday and Thursday respectively.

In December, the FARC announced its decision to release six hostages in a show of goodwill. Four of them were released in good health Sunday.