Daybreak's Health Editor Dr Hilary Jones has told Daybreak that there is a very high risk to premature babies.
"There is a very high risk of a child being handicapped if it is born before 24 weeks, even with modern technology," he added.
More top news
The Transport Secretary had been due to address the Northern Transport Summit in Manchester.
Police have launched a murder inquiry and two men are in custody.
Foreign Secretary Boris Johnson has faced calls to quit over his opposition to Heathrow expansion.