Over 50,000 AT&T outages were reported at about 7 a.m. ET Thursday, with most issues reported in Houston, Chicago, Dallas, Los Angeles, and Atlanta, according to tracking site Downdetector.

AT&T’s network suffered a widespread outages across the country Thursday morning with cellular service and internet down, according to the tracking site Downdetector.

Some Verizon and T-Mobile customers also reported outages, though theirs appeared to be less widespread than AT&T.

Over 32,000 AT&T outages were reported by customers at about 4 a.m. ET Thursday. Reports dipped then spiked again to more than 50,000 around 7 a.m., with most issues reported in Houston, Chicago, Dallas, Los Angeles, and Atlanta, according to the site.

That number surged to more than 71,000 just before 8 a.m. ET.

A little over 1,100 T-mobile outages and about 3,000 Verizon outages were reported as of 7 a.m. Thursday.

It’s not clear what triggered the service disruption.