Police in Maryland say a woman killed her 2-year-old son and then herself.
Prince George's County police said in a statement Sunday that the deaths occurred in a townhouse in Landover, a suburb of Washington, D.C. They were discovered Saturday night.
Police said the woman and her son died of asphyxiation. The motive remains under investigation.
Police identified the mother as 34-year-old Yu Song. Her son was named Joseph Wang. Both lived in Glen Burnie, a suburb of Baltimore.
Police discovered the mother and son after family members called 911. The relatives had asked police to check on them at the townhouse in Landover.