California's senate delegation is demanding details from telecommunications carriers about their data policies in the wake of reported data "throttling" of Santa Clara firefighters battling a massive July wildfire in the state. In a Sept. 6 letter to top executives at AT&T, Sprint, Verizon and T-Mobile, Sens.  Dianne Feinstein (D-Calif.) and Kamala Harris (D-Calif.) asked how the companies inform customers of service plans, as well as their practices of limiting data transmission by heavy users, a practice that has been called throttling. They also sent a letter to Federal Communications Commission Chairman Ajit Pai expressing "alarm" over the throttling of data traffic to Santa Clara County Fire Department as first responders battled the largest blaze in state history. The letters come amid a larger fight among states and at the FCC over the rollback of net neutrality rules earlier this year.  Harris and Feinstein have also backed a state bill, now in front of California Gov. Jerry Brown that restores net neutrality rules in the state.