A Canadian woman is in police custody in Britain in connection with the death of her two children, according to Canada's Department of Foreign Affairs.
Neither Canadian officials nor London police would release the woman's name, but British media reports have identified her as 34-year-old Felicia Boots.
Reports say her husband, Jeffrey Boots, a former investment banker with the Bank of Montreal, discovered the bodies of the children on Wednesday night when he returned home from work.
London police say the victims were a 10-week-old boy and a 14-month-old girl but would not speculate on the victims' identities or cause of death.
A police news release says a woman is being held on suspicion of murder and a spokesman says investigators are not seeking any other suspects.
Neighbours said the couple had moved into the five-bedroom house just two weeks ago and seemed happy and excited about the future, the Daily Telegraph reported.
But on Wednesday evening, Mr. Boots was heard wailing in the street, shortly before an ambulance and police cars arrived on the scene.
Autopsies are scheduled for Friday morning and police say they will release more details at that time.