Syrian troops pounded opposition areas all over the weekend, killingbr dozens of civilians in an offensive that has sent thousands ofbr refugees surging into Turkey before next week's UN-backed ceasefirebr aimed at staunching a year of bloodshed. Amateur activist video showedbr scenes of carnage while another video showed men who appeared to havebr been tied up and executed. Rebels and security force members were alsobr killed, raising the death toll in violence to over 100.