HOUSTON, July 3 (UPI) -- U.S. chemical engineers say they have developed a technology for cleanly converting problematic biofuel wastes into valuable organic acids.
GUATAMALA CITY, Guatemala, March 20 (UPI) -- Guatemalan authorities have arrested four people suspected of ordering the killings of three lawmakers from El Salvador that were visiting Guatemala.
GUATEMALA CITY, March 8 (UPI) -- Three Guatemalan security officials have resigned amid an ongoing investigation into the deaths of four police officers, Prensa Libre reported Thursday.
GUATEMALA CITY, Feb. 26 (UPI) -- Four Guatemalan police officers who were arrested in connection with the deaths of three Salvadoran lawmakers have been killed in jail.
SAN SALVADOR, El Salvador, Feb. 22 (UPI) -- Salvadoran police are confounded by the murders of lawmakers who were found dead in a car in Guatemala, La Prensa Grafica reported Thursday.
GUATEMALA CITY, Feb. 20 (UPI) -- Police have found the bodies of three politicians from El Salvador in a car in Guatemala's capital, La Prensa Grafica reported Tuesday.