An increase of Bt100,000 had been offered by a Good Samaritan who preferred not to be identified and was on top of Bt100,000 offered by the police, said Pol Maj-General Jitti Rodbangyang, a deputy Metropolitan Police Bureau commissioner.
He said police could not tell whether the two suspects seen carrying out the attacks in surveillance-camera footage were still in Thailand or had fled abroad.
MPB commissioner Pol Lt-General Sriwara Ransibrahmanakul said police could not hasten inquiries, as demanded by the media, as further evidence about the suspects was needed.