"I would classify this as quite suspicious," Doug Madory, director of Internet analysis at network management firm Dyn, told Ars. "Typically accidental leaks appear more voluminous and indiscriminate. This would appear to be targeted to financial institutions. A typical cause of these errors [is] in some sort of internal traffic engineering, but it would seem strange that someone would limit their traffic engineering to mostly financial networks."

https://arstechnica.com/security/2017/04/russian-controlled-telecom-hijacks-financial-services-internet-traffic/