Police have cordoned off the area around a house in Denver, Colorado in the US that was the scene of a shooting that left one adult and two children dead.
Details of the shooting remain unknown, but the local NBC TV station KUSA reported that one woman and two children were found dead at the home. One other child was reportedly taken to hospital.
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Ursula Keogh, 11, went missing on Monday around 3.30pm. She was dressed in her school uniform.
"My sincerest apologies to everyone who purchased tickets and were planning to come to the upcoming shows."
His comments at the Defence and Security Forum on Monday came after a £20 billion black hole in the budget for the next decade emerged.