Some oil tankers in the region were attacked, but they were not US tankers, the tankers were from nations that agreed not to put sanctions on Iran and it does not make sense for Iran to attack those oil tankers.
Adding to that we have Trump, he lies so often and as a result there is good reason to ignore Trump's assertions.
Israel has been pushing for over a decade to bomb Iran, they are getting beaten by Hezbollah which is supported by Iran. However if Israel is behind it and they are caught, you can say goodbye to the little sympathy they still have, it does not make sense for them to risk it,
So lets wait for independent proof.