Terrorists have killed at least 14 people in twin suicide bombings outside churches in eastern Pakistan.

More than 70 people were injured in the attacks in a Christian area of the city of Lahore.

Hundreds of people were leaving Sunday Mass when it's reported two men blew themselves up at the Catholic church and Christ Church in the city's Youhan Abad area.

One bomb targeted St John's Catholic church and the other hit a Church of Pakistan Church.

Pakistan: St. John's Catholic church attacked #Youhanabad is the largest majority Christian area in #Lahore pic.twitter.com/HdoxCBLZW5

— GMA (@no2persecution) March 15, 2015

Eyewitnesses say one bomber threw a grenade into the Catholic Church before blowing himself up by Pakistan police have refused to confirm this.

Witness Amir Masih told Dawn News: "I was sitting at a shop near the church when a blast jolted the area.

"I rushed towards the spot and saw the security guard scuffle with a man who was trying to enter the church, after failing, he blew himself up.

"I saw his body parts flying through the air...the guard died as well."

A spokesman for the emergency services said: "The rescue operation is still underway and the death toll may increase".

The group Jamatul Ahrar, part of the Pakistani Taliban, has claimed responsibility for the bombings.

The Pakistan Muslim League Nawaz leader Rana Mashood told Dawn News the "terrorists will be brought to justice".

"We have not looked at religion, they are our brothers and we have to deliver for them.

"We are not separated by religion, this is an attack on Pakistan, and we feel their pain. Their pain is felt by everyone.

"We are making arrangements for the casualties, they will be taken care of. We will follow procedure in this regard."

Local media has shown CCTV footage of the attack and an angry mob beating a person they thought was connected to the attack.

Pope Francis said he felt great pain over the bombings.

At his Angelus address he said: "These are Christian churches. Christians are persecuted, our brothers spill their blood simply because they are Christians".

He said he was praying for the country and that "this persecution of Christians, and that the world tries to hide it, finishes".

Wilson Chowdhry, Chairman of the British Pakistani Christian Association, said: "This latest attack on an innocent Christian community is symptomatic of the hatred and vilification that Christians and other minorities face in Pakistan.

"My heartaches for my brothers and sisters in Pakistan who are undergoing such extreme persecution.

"The global church has to speak out for this voiceless community or their suffering is set to get worse."

In 2013 a suicide attack on a church in Peshawar killed 127 people.

The BPCA has set up a fund to help those involved.

A memorial service for those killed in the church bombings will be held at Wanstead Baptist Church, London, at 5 this evening.

Wilson Chowdhry, Chairman of the British Pakistani Christian Association, speaking to Premier's Antony Bushfield: