Pope Francis has spoken out about violence against migrants, following a racially motivated attack against African migrants in Italy last week.
On Saturday, a neo-Nazi shot and injured six migrants in the coastal city of Macerata.
A copy of Hitler's book Mein Kampf was later found at his home.
Speaking during an address at the Vatican, the Pope asked Catholics to reflect on the causes of violence towards migrants, especially as the season of Lent approaches.
During Lent, Catholics are required to carry out extra charitable duties, and Pope Francis warned his congregation against allowing charity to turn "cold within [them]", prompting "violence against anyone we think is a threat to our own certainties: the unborn child, the elderly and infirm, the migrant, the alien among us".
The Pope did not directly refer to the attack in Macerata.