Story highlights

NEW: Police chief: A pipe bomb wrapped in white cloth caused the explosion

NEW: The death toll rises yet again, this time to 22

The area where the blast occurred hosts hotels, shopping centers, other tourist attractions

Bangkok, Thailand CNN  — 

A huge bomb explosion that appeared to target a popular Hindu shrine in central Bangkok killed at least 22 people Monday and wounded about 120 more, authorities said.

Twelve victims died at the scene, and the others died later at area hospitals