SYDNEY (Reuters) -Optus, Australia’s No. 2 telecom carrier, said on Sunday that a departure from regular processes on a network upgrade sparked a technical failure that disrupted emergency call services for 13 hours and has been linked to four deaths.

There has been growing outcry in Australia over the glitch, which Optus said occurred during a network firewall upgrade from 12:30 a.m. on Thursday (1430 GMT on Wednesday) until about 1:30 p.m. and potentially impacted 600 customers.

The government on Friday said it would investigate the company’s “unacceptable” failure, and Optus said the next day it would cooperate with any effort to look into the incident.

Optus CEO Stephen Rue said in a statement on Sunday the company’s own initial investigation has shown that established processes wer

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