The helicopters carry out a 20-minute attack on rebel positions in Zamboanga City . The armed forces are trying to `` constrict '' the rebels ' positions , a spokesman says . He described the operation as `` delicate , '' as the troops try to avoid harming hostages and any other civilians caught in the parts of Zamboanga where the rebels are holed up . Authorities estimate that more than 60 people have been killed during the crisis . - A Philippine military helicopter crashes into Mount Pinatubo volcano near the city of Cotabato in central Philippines.
The helicopters carry out a 20-minute attack on rebel positions in Zamboanga City . The armed forces are trying to `` constrict '' the rebels ' positions , a spokesman says . Authorities estimate that more than 60 people have been killed during the crisis . - A Philippine military helicopter crashes into Mount Pinatubo volcano near the city of Cotabato in central Philippines.