Pope Francis condemned the Easter Sunday suicide bomb in Lahore, Pakistan - which killed 70 people, including many Christians - as "hideous".
Addressing crowds in St Peter's Square, he demanded Pakistan's government afford more protection to religious minorities.
The Pope described last night's attack as a "vile and senseless crime".
I appeal to civil authorities and all sectors of that nation to make every effort to restore security and serenity to the population, and in particular to the most vulnerable religious minorities.
The death toll from the suicide bomb attack in Lahore has risen to at least 70.
Rescue services spokeswoman Deeba Shahnaz said at least 70 people were killed and about 340 were wounded, with 25 in serious condition.
Lahore is the capital of Pakistan's richest province, Punjab, and is seen as the country's political and cultural heartland.
Video report by ITV News' Helen Callaghan.
A small Christian community was the target of a suicide bombing at a public park in Lahore, Pakistan.
A faction of the Taliban claimed responsibility for the attack, which happened near to where children were playing on swings and rides.
Many of the victims were women and children and witnesses described distressing scenes of chaos.
Prime Minister David Cameron has expressed his "shock" at the suicide bomb attack in Lahore which has killed 65 people.
He also pledged that the UK "will do what we can to help".
I'm shocked by the terrorist attack in Lahore. My thoughts are with the families and friends of the victims. We will do what we can to help.
Labour leader Jeremy Corbyn also said his "thoughts" were with the victims and their families.
My thoughts are with the victims & the family of the victims of the horrific attack in Lahore. Solidarity with the emergency services there
The Taliban faction Jamaat-ul-Ahrar has claimed responsibility for a suicide bomb attack that killed at least 65 people in the Pakistani city of Lahore on Easter Day.
In a statement the group said the target of its attack was Pakistan's Christian minority.
The target were Christians.
We want to send this message to Prime Minister Nawaz Sharif that we have entered Lahore. He can do what he wants but he won't be able to stop us. Our suicide bombers will continue these attacks.
Islamist militants in Pakistan have attacked Christians and other religious minorities often over the past decade.
Christians have accused the government of doing little to protect them.
Nobel Peace Prize winner Malala Yousafzai has condemned an attack at a park in Lahore, Pakistan which has killed at least 65 people.
In a statement posted on Twitter she described the bombing as "senseless" and urged Pakistan and the world to unite against terrror.
I am devastated by the senseless killing of innocent people today in Lahore. My heart goes out to the victims and their families and friends.
I condemn this attack in the strongest possible terms. We stand together with the families of the victims.
Pakistan and the world must unite. Every life is precious and must be protected and respected.
Users thousands of miles from Lahore have reported being asked to check in safe following the bombing which killed at least 65 people.Read the full story ›
Police say at least 280 other people are injured, and most of the dead and injured are women and children.Read the full story ›
At least 10 people have been killed in an explosion outside a public park in the city of Lahore in Pakistan.
Rescue officials said more than 30 people were injured, most of whom are women and children.
Police said the nature of the blast was not clear.
At least 15 people are dead after a bomb exploded on a bus carrying government officials in the northwest Pakistan city of Peshawar.Read the full story ›