I have not seen anything about US intelligence reports proving Hamas was behind it. So far only Biden has said that he believes it. He has not even said that he had proof.
And honestly, what else could he really say, especially just after meeting Netanyahu and meeting various Israeli bigwigs ? If he doesn't deny that IDF was it, he would have problems defending his support for Israel. And it would insult all the people he just talked to.
But he is not claiming to be certain or have proof or that the US intelligence has proof. So he can safely backtrack later, if needed.
And just to be certain : Even the IDF-story claims it was a rocket from Islamic Jihad, not from Hamas itself.
And honestly, what else could he really say, especially just after meeting Netanyahu and meeting various Israeli bigwigs ? If he doesn't deny that IDF was it, he would have problems defending his support for Israel. And it would insult all the people he just talked to.
But he is not claiming to be certain or have proof or that the US intelligence has proof. So he can safely backtrack later, if needed.
And just to be certain : Even the IDF-story claims it was a rocket from Islamic Jihad, not from Hamas itself.