A man accused of abusing his 5-month-old son told police he may have shaken the infant when he found him unresponsive in his crib, according to an arrest affidavit.

Police arrested Christopher A. Mazzarelli, 40, on Thursday on charges of felony child abuse after Mazzarelli's infant son showed signs of serious head trauma when he was admitted to the hospital on Monday.

The infant suffered a brain hemorrhage as well as retinal hemorrhages consistent with abuse doctors told a Colorado Springs police detective investigating the case. The baby's condition was not available Thursday evening.

According to the arrest affidavit, Mazzarelli was alone with the baby beginning Monday afternoon when his wife went to work.

The baby was crying and screaming inconsolably for several hours, the affidavit says.

Mazzarelli at first told police that he found the child unresponsive in his crib and immediately went to St. Francis Hospital. The baby was later transferred to Memorial Hospital Central.

Mazzarelli later told police he may have shaken the baby with short small shaking motions when he found him unresponsive in the crib and then may have put the infant down roughly in the crib.

Police asked Mazzarelli on a scale from 1 to 10 how hard he shook the infant, and according to the affidavit Mazzarelli responded a seven with 10 being the hardest.

He was arrested on charges of child abuse causing serious bodily injury, a class three felony.