Posted by ESPN.com's Kevin Seifert
DETROIT -- Things just got really interesting at Ford Field.
Minnesota right end Jared Allen limped off the field with an apparent left knee injury. But before he got off the field, Allen had to be held back from attacking Detroit right tackle Gosder Cherilus -- who caused the injury by cutting Allen below the knee on a pass rush.
No penalty was called, but Allen was livid and had to be restrained by teammate Ray Edwards.
The series of plays has definitely ratcheted up the intensity here at Ford Field.
Allen was initially replaced by Otis Grigsby but has since returned.
Meanwhile, Frerotte has come up with a lower back injury. We'll keep you updated.