Blackwell said he has personally spoken to the Honduran President Porfirio Lobo and his minister of security about a possible truce but that there is no formal accord yet.
"There is no formal agreement like we have in El Salvador," he added.
The Maras have their roots in Southern California, where young men seeking refuge from Central America's civil wars formed violent gangs on the streets of Los Angeles and its suburbs in the 1980s. Gang members later deported from the U.S. re-established their violent organizations in their native countries of El Salvador, Guatemala and Honduras.
Honduras has the highest murder rate in the world, according to U.N. figures.