Emergency laws will be rushed through the Parliament to allow police and MI5 to investigate people's mobile phone and internet data.
The new measures will mean phone and internet companies will be required to store data for a year.
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Opportunities were missed to prevent two teenage British Muslims being radicalised before they were killed fighting in Syria.
Charlie Gard will "inevitably" die shortly after being moved to a hospice and having life-support treatment withdrawn.
Cody-Anne Jackson, who made a "sham" 999 call, several hours after suffocating Macey Hogan, will serve at least 16 years in jail.