The outage was most acute in northern Europe and Brazil but lasted less than an hour, according to downdetector.com, which tracks disruptions across telecommunications services.
California-based WhatsApp, which Facebook Inc purchased for $19 billion in 2014, is among the most popular messaging services in the world.
(Reporting by David Ingram; Editing by Chizu Nomiyama and Marguerita Choy)
© Thomson Reuters 2017
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