New York Mayor Bill de Blasio has described Saturday night's explosion in the Chelsea neighbourhood of New York City as 'intentional'.
The blast - which was heard blocks away, injured at least 29 people, one of them seriously, and 24 have been taken to local hospitals.
But as Lorna Shaddick reports from New York, authorities are being cautious about linking the incident to terrorism despite a second device reportedly found in the same area.
IN: The exact cause...
OUT: SOC
DUR: 51 seconds
POT: 20, 29, 34 seconds
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