The 28-year-old from Staffordshire had been imprisoned in 2012 after plotting to bomb the London Stock Exchange.
The bodies of a 32-year-old man and a 23-year-old woman were discovered at a house in Burton-on-Trent on Wednesday.
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Two adults and another child are being treated in hospital.
In a new series, we're reporting on how local cuts link up to reveal a national portrait of life under austerity.
A huge fire at one of Amazon’s flagship UK warehouses was “most likely” caused by arsonists, firefighters have warned after
Police footage also shows him standing up and taking selfies.