GENEVA, Feb 25 - The Syrian opposition delegation at peace talks in Geneva on Saturday condemned an attack that killed security forces in Homs earlier in the day, but accused the government of trying to use the events to derail the negotiations."We condemn all terrorist acts done by all terrorist groups. If the Homs operation was done by any of those, it is clear what I say," lead negotiator Nasr al-Hariri told reporters."They just want to remain in power. The regime is trying to block the negotiations," he added, saying he would not walk away from the talks.Colonel Fateh Hassoun, a member of the opposition negotiating team, suggested that government forces may have been behind the attack.