To throw a new aspect into this conversation, I heard on the radio this morning that the dysfunctional Trump administration struck a blow to the investigation. It was someone here who released the name of the bomber before the UK investigators were ready (alerting confederates to go into hiding, etc.)

https://www.theguardian.com/uk-news/2017/may/23/trump-administration-manchester-bomber-name-leak

Salman Abedi was identified in media reports that attributed "US officials" as the source even as their British counterparts remained tight-lipped.

The disclosures renewed concerns over leaks from Donald Trump's administration two weeks after the US president revealed classified information, apparently from Israel, to Russia's foreign minister in a White House meeting. Critics warn that US allies may be less willing to share intelligence in the future.

Although UK journalists had Abedi's name, the UK government and Greater Manchester police declined to confirm it more than two hours after it appeared in the US press. Earlier in the day, the government indicated it might not release the name at all on Tuesday because the investigation was continuing.

On Monday night, a correspondent for America's ABC network tweeted: "Leading theory is Manchester was a suicide bomber, US senior law enforcement official briefed on the investigation tells @ABC."

Just because those idiots in the White House have a whole bunch of fancy resources doesn't mean they get to release news at-will.