The warning followed double nighttime attacks that killed two policemen and wounded 13 people, denting hopes that a reconciliation plan offered by the government last week would resolve the crisis peacefully.

The so-called Red Shirts said they would unveil their own proposal to resolve the crisis in the next few days, pledging it would be flexible and open to negotiations. Nattawut Saikua, a protest leader, said he agreed with the government that the reconciliation process should be finalized by May 15.

“(We) are willing to hear what the government has to say and what other sectors of the society think because it’s about civilians and government finding a solution to the national crisis together,” he said. But government spokesman Panithan Wattanayagorn earlier said if the protesters didn’t end their occupation of Bangkok’s prime commercial district “some people who don’t wish to see reconciliation take place may take this opportunity to launch another attack.”

He described the unknown assailants responsible for several attacks in the capital as “ill-intentioned people who used terror to try to ruin the conciliatory atmosphere.” Violence tied to the protest — including clashes between demonstrators and security forces — has killed 29 people and wounded nearly 1,000. On Friday, protest leaders signaled they generally agreed with the reconciliation plan and might soon end the protracted demonstrations. Protest leaders denied Red Shirt involvement in the attacks and urged security forces be withdrawn from the streets, noting they only served as “lightning rods” for those trying to provoke violence.

They also indicated their occupation would continue while they sought a deal with the government, saying the two were not mutually exclusive.

“No matter who and whatever is trying to obstruct us, we will carry on our protest (in central Bangkok),” Weng Tojirakarn, a protest leader, said Saturday.

The protesters say they agree in principle with a proposal by Prime Minister Abhisit Vejjajiva to dissolve Parliament and hold new polls — their key demands — but want more specific details including the exact date for the dissolution.