violence here in syria and that it is civilians who are suffering the most, fredricka. >> frederick pleitgen, thank you so much. let's go to the white house now with correspondent abby phillips. the president is tweeting on this suspected attack and blaming multiple parties. >> that's right, fred. the president has been briefed on this alleged attack, and in harsh terms, it is sharply criticizing russia, iran, vladimir putin by name, but also his predecessor, barack obama. in some of these tweets, the president is calling on assad to open up the area to inspection and also to allow humanitarian aid. he says open area immediately for medical help and verification. another humanitarian disaster for no reason whatsoever. the president also criticizing president obama here in some of these tweets saying they cross the sand in syria ended long ago and assad would be history.