Saskatoon police responded to a rollover around 8:30 a.m. Saturday at the cloverleaf of Highway 11 and Circle Drive in the south end. A semi tractor and two trailers rolled over spilling what appeared to be agriculture seed, a police news release said. No injuries were reported. Northbound traffic on Highway 11 is down to one lane. The eastbound Circle Dr exit to northbound Circle Dr is closed.