Investigators are reviewing records from his 20-year stay in the US to trace when his radicalisation began. Authorities suspect the attack on security personnel was deliberate, possibly aimed at testing response times rather than being a random act.

Thane accused who stabbed guards studied maps of sensitive areas in Mumbai, consumed radical content

'Lone wolf' terrorists feed off each other

'Lone wolf' attackers not really alone

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Thane accused who stabbed guards studied maps of sensitive areas in Mumbai, consumed radical content

'Lone wolf' attackers not really alone