Chief Constable Serena Kennedy said Rudakubana also had an Al-Qaida jihad training manual.
Rudakubana, who police said was born in Wales, already faced three counts of murder over the deaths of Alice Dasilva Aguiar, 9, Elsie Dot Stancombe, 7, and Bebe King, 6, in the seaside town of Southport in northwest England.
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