Crews in East Tennessee are on standby to help Middle Tennessee as much as they can following a line of deadly tornadoes.

Knox County Rescue's Heavy/Collapse Team responded to Putnam County, where at least 18 deaths have been reported so far, early Tuesday morning. 

Knoxville Fire Department crews joined them for deployment around 11:30 a.m. 

The Scott County Rescue Squad also sent a crew to help in Middle Tennessee.

RELATED: 24 dead after tornadoes tear through Nashville, Middle Tennessee

Tennessee Wildlife Resource Agency officers have also joined efforts in communities affected by the tornadoes. 

"Our hearts are heavy for our neighbors, our friends, loved ones and the communities that surround us. We're grateful for first responders, volunteers and the many hands helping in this time of need," TWRA wrote in a post on Facebook Wednesday.

TDOT crews also went to help. They left Knoxville at 6 a.m. Thursday, carrying people and equipment to help clear state roads around the damaged area.

Tornadoes ripped across Tennessee overnight, shredding at least 40 buildings in the Nashville area and 100 more east of the city as it killed at least 22 people. 

RELATED: At least 16 people killed in Putnam County tornado, crews still searching devastated areas

RELATED: LIST: 24 people remain missing in Putnam Co. after overnight tornado

One of the twisters caused severe damage across downtown Nashville on Tuesday, leaving blown-down walls and roofs, snapped power lines, huge broken trees, and city streets in gridlock.

One twister damaged a 10-mile stretch of Nashville early Tuesday, leaving blown-down walls and roofs, snapped power lines, huge broken trees, and city streets in gridlock.

RELATED: Storm damage in Morgan County but no reported injuries

Another wiped out much of a subdivision in Putnam County, where the sheriff says more survivors could be trapped in the rubble of their homes. 

Damaged polling stations have been closed, forcing Super Tuesday voters to wait in long lines at other sites. President Donald Trump said he'd visit the area Friday.  

RELATED: "It's a vicious thing" President Trump sends prayers to Tennessee, plans to visit Friday