US officials raise concerns over Israeli intelligence after Hamas attacks

American officials said Saturday they received no warning through intelligence that Hamas was preparing to attack Israel, leading to confusion among some at how Israel failed to detect signs of the rocket assault.

The capability of Hamas to coordinate terrorist attacks on Israeli towns without detection has raised concerns about technological blind spots for US intelligence officials, a senior US intelligence official told CNN.

US officials had been monitoring indications that tensions were escalating in recent months. But there was no tactical-level intelligence that alerted US officials that an attack of this size would happen on this day.

The question for US and Israeli intelligence officials now is whether there were indicators that were missed - or whether Israel and the US failed to collect any information that would have helped predict the assault.

Israeli and US officials will compile reports "in the coming days to see whether there were things missed or if there was intelligence collected and misread, or if we have a completely dark area we didn't know about," the official said.

A senior American military official said the US was not tracking an imminent attack on Israel in the last several days.

Other US officials familiar with the matter said if the US did have intelligence suggesting an upcoming attack, it would have undoubtedly shared that information with Israel.