COSTELLO: In Bangkok, Thailand the investigation into that deadly bombing at a Hindu shrine is currently centered on, quote, "a woman in a black shirt". Police did not provide any more details or say why they were looking for her, but they did dramatically increase the reward in the case. CNN's Andrew Stevens is in Bangkok with the latest.</s>ANDREW STEVENS, CNN INTERNATIONAL CORRESPONDENT: Police in Bangkok now say they think at least ten people were involved, and what they say was a well-organized team that executed the attack on Erawan Shrine on Monday evening. They say they've obtained evidence to suggest that several people were involved in plotting the attack and also acquiring the materials as well as building the bomb, all done under the radar, of course. They haven't shared what that evidence is at the moment. At this stage they're also pulling back on making any link with international terrorism. They say they have been talking to Interpol and sharing information with security agencies in the U.S., the U.K. and Australia, and the consensus opinion is that it is not an international conspiracy which brings the focus at least somewhat back onto domestic issues. And they say they're not ruling anything out at this stage. They've, meanwhile, increased the reward for any information leading to the arrest of the man in the yellow shirt, the man they say they're now very sure is the bomber. Apart from the early breakthrough when they identified the man they think is the bomber, there's been very little else solid and concrete. They've actually ruled out two other suspects they thought were initially accomplices, and they're now saying that the network that was used may be more than ten people. Very frustrating for the police, but also very frustrating and also very worrying for the people of Bangkok.</s>COSTELLO: Andrew Stevens, thanks. I'll be right back.
"Woman in Black Shirt" Sought by Thai Police.