By By FRED MUKINDA | The Monitor | Oct 04, 2012 Police in Kenya have issued a fresh terror alert, asking the public to be extra vigilant and report suspicious persons to the authorities. They also issued instructions on Tuesday on how to identify suspects and gave guidelines to landlords, hotel and lodgings attendants, shop owners as well as public service vehicle crews on what to do to ensure public safety. Among other measures, customers are to be subjected to polite interrogations besides producing identification documents before being allowed into rental houses or hotel rooms. Politely create an opportunity to interview all strangers to establish their identity, who they are, where they are coming from and where they are going, police spokesperson Eric Kiraithe said. He added: Attempt interrogation to isolate open lies or deliberately inaccurate information. Alert authorities if they display anxiety or turn hostile . In case of suicide bombers, the police said, a suspect body frame would appear rigid because they would be wearing specially made vests laden with explosives. The caution was given following intelligence reports that the terrorist group al-Shabaab was planning a series of attacks. Security officers were further alarmed that British fugitive Samantha Lewthwaite, who entered Kenya last year, could be planning a suicide bombing. The public should also look out for those wearing bulky clothes that may not fit the weather and tightened fists would be a signal they are holding an explosive, the police added. Security guards who screen people using metal detectors were also asked to pay closer attention with the aim of identifying exposed wires possibly through sleeves as they could be detonators.