Bangkok bombing: broken security cameras add to investigators' woes

Thailand police use 'imagination' to 'connect the dots' in search for prime suspect who set off a bomb which killed 20 and injured 120

Police in Thailand say they have used their "imagination" to piece together the movements of the prime suspect in a bomb attack at a shrine last week that killed 20 people because most of the security cameras on the getaway route were broken.

Related: Bangkok explosion: fatal blast at Erawan shrine