ALEXANDER, Ill. (AP) — A reported tornado has damaged a semi-trailer on Interstate 72 in central Illinois as a line of storms rumbled across parts of the state.

National Weather Service meteorologist Alex Erwin says a storm spotter reported seeing a twister cross the freeway Monday afternoon near Alexander. Alexander is west of Springfield.

Another spotter reported seeing a tornado about 3:30 p.m. near Roodhouse, southwest of Springfield. A line of thunderstorms was moving quickly Monday afternoon through that part of Illinois.

Erwin says the weather service has not yet confirmed the reports of tornadoes. A tornado watch was issued for portions of north central and northeast Illinois and northwest Indiana as part of storms that also moved through the region.