>> reporter: carlos granda reporting for abc news. >> so 600 pictures. and those new photos were found at an l.a. pharmacy's photo printing database. what happens if you're the developer of those photos and you come across these pictures? you have to report them. >> i assume there's a legal and moral obligation certainly to report it. and it doesn't stop there. detectives say a teacher's aide wrote love letters to fourth grade students. and complaints about those letters were apparently disregarded. a parent of one of the kids found the letters nearly three years ago. so this has been a year's long situation at this school that's now just bubbling to the surface. who knows what else they could find at this point? well, overseas now the white house is debating what to do about syria. where the government's war against civilians is growing exponentially worse. syrian troops launched their fiercest assault yet on the city of homs. at least 50 were reported killed on wednesday, including some premature babies at a hospital. it is too dangerous to go out for food or water. one activist is sending video messages pleading for help.