GUATEMALA CITY, Sept 25 (Reuters) - Heavy rains overnight caused a river in Guatemala's capital to burst its banks, killing at least six people and leaving 13 others missing, authorities said on Monday. Six homes were swept away after the Las Vacas river, which runs through Guatemala City, overflowed in an area about three km (1.8 miles) south of downtown, Guatemala's national disaster agency Conred said. The girl killed was likely between three and five years old, Conred field technician Kevin Escobar told journalists. Before Sunday evening's rains, at least 29 people had been killed due to flooding in Guatemala this rainy season, according to Conred. Reporting by Sofia Menchu; Writing by Kylie Madry; editing by Rami Ayyub and Sandra MalerOur Standards: The Thomson Reuters Trust Principles.

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Persons: Conred, We've, we'll, Sergio Cabanas, Kevin Escobar, Alejandro Giammattei, Sofia Menchu, Kylie Madry, Rami Ayyub, Sandra Maler Organizations: GUATEMALA CITY, Twitter, Thomson Locations: GUATEMALA, Guatemala's, Guatemala City, downtown, Guatemala