Following is a summary of current world news briefs.Slain security guard of California mosque engaged gunmen in shootout, hailed as heroThe security guard slain at the Islamic Center of San Diego was hailed on Tuesday as a fallen hero who sacrificed his life to keep 140 school children inside the mosque safe by engaging two gunmen in a shootout that deterred the teenage suspects and helped thwart their attack. Authorities also disclosed that the 17- and ?18-year-old assailants, who took their own lives shortly after Monday's shooting, were believed to have met online and apparently were "radicalized" in hate-related ideology…