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Updated at 10:45 p.m. ET

At least 10 people were killed when a gunman opened fire inside a small-town Texas high school, in what Gov. Greg Abbott called "probably the worst disaster ever to strike this community."

Ten others were wounded in the morning attack at Santa Fe High School.

Updated at 12:15 a.m. ET

The National Hurricane Center says Harvey is now a tropical depression. As of 8 p.m. ET, the storm was located southwest of Alexandria, La., with sustained winds of 35 mph.

As Tropical Storm Harvey, it had made landfall in Louisiana, at 4 a.m. Central time, just west of Cameron, according to the Center.

The confirmed death toll from Harvey is at least 25, across five Texas counties — although that figure is likely to rise and does not include people who are missing or believed dead.

Updated 5:30 p.m. ET

In Houston, reservoirs swollen by rain from Hurricane Harvey were opened early Monday, a move that was expected to flood more homes — but one that the Army Corps of Engineers says is needed to limit the scope of the disaster that's threatening lives and property in Texas.