Hundreds of American businesses have been hit by a ransomware attack ahead of the Fourth of July holiday weekend, according to the cybersecurity company Huntress Labs. Huntress Labs said on Friday that 200 American businesses were hit after an incident at the Miami-based IT firm Kaseya, potentially marking the latest in a line of hacks destabilizing US companies. “This is a colossal and devastating supply chain attack,” John Hammond, a senior security researcher with Huntress, said in an email, referring to an increasingly high profile hacker technique of hijacking one piece of software to compromise hundreds or thousands of users...