How a crippling shortage of analysts let the London Bridge attackers through | UK news | The Guardian
▻https://www.theguardian.com/uk-news/2017/jun/10/london-bridge-attackers-intelligence-overload
“The biggest challenge facing intelligence agencies is the vast amount of information they have to process. Data is siloed and collected at various stages; it has to be moved before it can be processed. Limited talent and resources also play a role. Collecting is the primary challenge, but when this information is collected, the real work begins.”