bangkok thai authorities close people help former prime minister yingluck shinawatra flee country last month thai deputy prime minister prawit wongsuwan say friday shinawatra 50 whose government oust military 2014 disappear thailand shortly supreme court verdict negligence case deputy prime minister tell media yingluck leave thailand cross neighbor cambodia land via aranyaprathet border district sa kaeo province almost 300 km 186 miles east capital bangkok say authorities seize vehicle believe use take yingluck cambodian border vehicle find near house nakhon pathom province north bangkok police say owner base car registration match person car time three police officer question thursday night prawit say three men admit help drive yingluck border charge yet file three give us useful information work investigation consolidation evidence deputy national police chief general srivara rangsibrahmanakul say police source wish name tell reuters ongoing investigation reveal former police chief close relationship shinawatra family mastermind yingluck escape yingluck whereabouts remain unknown supreme court issue arrest warrant yingluck reschedule verdict negligence case sept. 27. yingluck face 10 years prison find guilty negligence costly rice subsidy scheme help bring power 2011 general election yingluck accuse military government political persecution plead innocent negligence charge thai authorities close yingluck 's escape accomplices