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Congressional computers used by members of the U.S. House of Representatives have been the target of ransomware attacks in recent days [theintercept.com]. Some web services are being blocked [bbc.com]:
A series of ransomware attacks on the House of Representatives has led US Congress to ban members from using Yahoo Mail, according to a leaked email. Both Yahoo Mail and Gmail are named in the 30 April email, published on Thursday by Gizmodo [gizmodo.com], saying the attacks had increased "in the past 48 hours". Yahoo Mail will be blocked "until further notice" it adds.
[...] Meanwhile, an unnamed House of Representatives employee has told Reuters devices connected to the internet via its wi-fi or ethernet cables have been barred from accessing appspot.com, the domain where Google hosts custom-built apps.