Coverage of this war is by far the least informative of any such conflict in my lifetime. The linked report has no context. Trying to piece things together, it appears the sequence of events leading to the current Iranian attacks on the UAE was:

1) UAE flagged tanker(s) attempt to pass the Iranian blockade.

2) Iran fires on the UAE tanker(s) from small craft.

3) U.S. fires on Iranian small craft.

4) Iran launches attacks on the UAE.

There may have been additional attacks somewhere in that sequence, but that's the best picture I can make out.