Indonesian security forces were investigating unconfirmed reports that a suicide bomber was planning to infiltrate demonstrations during US President George W. Bush's visit on Monday, police said. "We have been informed about a report that man wearing a (suicide) vest would infiltrate the protests," said Col. Sukrawardi Dahlan, the police chief in Bogor, where Bush is scheduled to meet with President Susilo Bambang Yudhoyono. He was vague about the source of the information, citing only "media reports, local organizations and contacts," and refused to say if intelligence networks had confirmed the report. But it was being taken seriously, Dahlan said. "We're very sensitive about such reports ... because, in fact, we have had suicide bombers in Indonesia wearing jackets or backpacks. We want to protect the people."