So far, police seem to be taking the ‘history of mental illness with no known links to terror groups line’ (which could be true but this happened only three hours ago and he’s only been in custody two hours so even if he’s known to them, they haven’t had much chance to find out anything new). Expected to be a statement from a senior officer shortly (probably the state police Assistant Commissioner) but I doubt they’ll be saying much more yet. Real facts might start emerging tomorrow.