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A car is seen partially submerged during rising floodwater at the Pecan Valley Estates trailer park in Bossier City, La., Wednesday.

BOSSIER CITY, LA. >> The Latest on heavy rain storms moving across north Louisiana (all times local):

6:15 a.m.

By Thursday morning, officials in north Louisiana have evacuated 3,500 home in Bossier City as a precaution as Red Chute Bayou approaches the top of its levee.

National Weather Service Meteorologist Jason Hansford says the bayou may top the levee or be breached.

Hansford say heavy rain continued across much of north Louisiana on Wednesday night and early Thursday morning with another 3 inches.

He says a weather spotter just north of Monroe reported 18.1 inches of rain since Tuesday night.

State police report several sections of Interstate 20 are closed from Bossier City to near Gibsland in northcentral Louisiana.

Three people drowned in flooding across Oklahoma, Texas and Louisiana.

3 a.m.

A second round of rain early Thursday was hitting an already inundated north Louisiana, where flooding in some places was up to the rooftops and in others submerged cars, stranded families and forced evacuations.

Three people drowned in Oklahoma, Texas and Louisiana.

Several Louisiana parishes have declared a state of emergency, and the National Guard was sent in to help.

Louisiana Gov. John Bel Edwards issued the order affecting Acadia, Bienville, Bossier, Caddo, Claiborne, Desoto, East Carroll, Grant, Lincoln, Morehouse, Ouachita, Red River, Richland, Union, Webster and West Carroll parishes after nearly a foot of rain fell Tuesday night and Wednesday.