Ten pigs died in the crash.Authorities rounded up the pigs, some of which were injured.Investigators are looking into what caused the semi to tip on its side as it navigated the curve on I-694 where it joins with northbound Interstate 35E.Nearly five years ago, more than 20 pigs spilled onto the roads in a more rural part of the state after a semitruck overturned at a highway interchange near Mankato.