WhatsApp went down all over the world for several hours on Wednesday

Messaging app WhatsApp was back in service late on Wednesday after a global outage knocked the 1.2 billion-member service offline across the world for several hours. 
"Earlier today, WhatsApp users in all parts of the world were unable to access WhatsApp for a few hours. We have now fixed the issue and apologize for the inconvenience," a WhatsApp spokesperson said in an email.
The spokesperson told Business Insider the outage was caused by WhatsApp itself, rather than by an