Police in central Pakistan on Monday arrested one of two brothers earlier convicted in connection with cannibalism, after a baby’s head was found at their home, officials said.

The brothers, Muhammad Arif and Farman Ali were released from jail in 2013 after serving a two-year term for desecrating graves after they stole corpses from graveyards and ate their flesh.

Arif was arrested again on Monday when police recovered the severed head of a baby boy from their house in Darya Khan town in Punjab province, police official Ameer Abdullah said.

It was not immediately known whether they killed the baby or took it from a grave.

Police were conducting raids in search of Ali.