Texas and New Mexico health departments said on Friday that the number of measles cases in their states rose 20% since their last reports three days ago, as experts warn they expect the outbreak to further spread in coming weeks.

Measles outbreaks in West Texas and New Mexico now have 370 cases in total. Two unvaccinated people have died from measles-related causes.

The measles outbreak that began in northwest Texas grew to 327 cases on Tuesday, with dozens more reported in New Mexico and Oklahoma. The latest update from the Texas Department of State Health Services shows that nearly 70% of all cases in Texas have been in Gaines County,