#Thailandbr #Cambodiabr #BBCNewsbr At least 12 Thai nationals, most of whom are civilians, have been killed in clashes with Cambodian troops in a disputed border area between the two countries.br br While there have been sporadic clashes over the years, the latest tensions ramped up in May after a Cambodian soldier was killed in a clash.br br Both sides have accused the other of firing the first shot on Thursday morning, and Thailand has now closed its border with Cambodia after telling all its nationals there to leave.br br Subscribe here: br For more news, analysis and features visit: www.bbc.