Bangkok bombing :Thai authorities say they have made "much progress"

Thai authorities say they have made "much progress" in their investigation of Monday's bombing in central Bangkok that killed 20 people.

The latest on the bombings in the Thai capital (all times local):

A spokesman for Thailand's ruling junta said they have been able to use closed circuit television to learn the transportation route that the main suspect took to and from the downtown Erawan shrine.

Col Winthai Suvaree also said Saturday that a police artist's sketch of the unidentified suspect has been distributed to border crossings.

1:15pm

New surveillance video has surfaced in Thailand offering a possible clue to Monday's bombing in downtown Bangkok that took 20 lives.

Video leaked to Thai media shows a man in a blue shirt placing a bag on a riverside walkway, then kicking it into the water on Monday night shortly after the explosion several kilometers (miles) away at the Erawan shrine.

At about 1:00pm Tuesday, an explosion took place in the water canal near a busy pier without hurting anyone.

Police spokesman Prawuth Thawornsiri said Saturday that police are seeking the man for questioning, even though it remains unclear if his actions had anything to do with either explosion.