Verse (11:70) did Ibrahim recognize his visitors as Angels or not?

In surat Hud when discussing the punishment of the people of Lut () the quran tell us that some Angels visited Ibrahim () to tell him about this, but they are described as visitors. And Ibrahim () wanted to welcome them with a fine meal, but then it says: > But when he saw their hands not reaching for it, he distrusted them and felt from them apprehension. ... (11:70 ) - Does this means that Ibrahim () didn't recognize them as Angels -until this moment-? - If so when did he recognize them? - And what made him fear and mistrust his visitors, when they didn't eat or rejected to eat from the presented meat?