Bangkok PM Vows to Bring Bomber to Justice

Bangkok Prime Minister Prayuth Chan-ocha vows to track down whoever is behind a deadly explosion.

In an address to the nation, Prayuth said the government will expedite "all investigative efforts to find the perpetrators and bring them to justice."

The blast happened Monday at a popular shrine at a busy Bangkok intersection. It killed 20 people and injured 140.

A police spokesman said a man was seen in security video wearing a yellow t-shirt and carrying a backpack.

Investigators spent Monday night and Tuesday morning combing through the debris at Rachaprasong intersection.

There was a second explosion Tuesday at a ferry pier in the capital, but no one was hurt.

Security camera video shows a sudden blast of water dousing people on a walkway at the pier, as bystanders ran for safety.