Thousands lined up to donate blood at hospitals in Pakistan's second largest city Lahore after a bombing at a popular children's park in the Iqbal Town neighborhood.

At least 70 people were killed and over 250 injured at Gulshan-i-Iqbal Park. Most of the victims of the bombing are women and children.

The devastating attack took place a few meters away from a children's playground, at a time when the park was crowded with women and children celebrating Easter Sunday.

Lahore-based Journalist Rabia Mehmood, who has compiled one of the most comprehensive reports on religious persecution and violence against minorities in Pakistan, tweeted:

Following the attack, scores of citizens began coordinating efforts to donate blood and provide support to the families of the victims.

I love you Lahore. pic.twitter.com/6j4AAyjgeM — Nadia Jamil (@NJLahori) March 27, 2016

Dubai-based Pakistani Anthony Permal, who used to blog under the name Digital Christ, posted on Facebook:

It is easy to hate. They want us to hate. But the terrorist have lost. You know how I know? Because right now thousands of Lahori men and women are queueing up outside hospitals to donate blood. Tonight, Muslim blood will flow through Christian bodies. And vice versa. You see, in hurting us, you united us. Thank you. ‪#‎LahoreStrong‬

Careem, a local on-demand taxi service, are offering free transport to the hospital for anyone willing to donate blood.

Free Transport to Donors #Lahore. Careem offering free car rides to all those going to donate blood. 042-35909393 pic.twitter.com/gI8dmS1vfQ — Jibran Nasir (@MJibranNasir) March 27, 2016

Dawn, one of Pakistan's most popular news sites, also tweeted urging people to donate blood.

#LAHORE REQUEST FOR BLOOD DONATION Jinnah Hospital is running short of blood. Blood donations are required urgently. — Dawn.com (@dawn_com) March 27, 2016

And activists stepped up to coordinate efforts online:

If you want to coordinate efforts to help the victims of #LahoreBlast, plz fill out this Google form & share widely https://t.co/1cwHODyer2 — Nuzhat S. Siddiqi (@guldaar) March 27, 2016

The activists behind the form will focus “on providing food, medicine, wheelchairs/crutches or funeral services for those who cannot afford them for their loved ones.”

Meanwhile, seven hours after the bombing, Pakistani activist Jibran Nasir, who has over 70,000 Facebook followers and ran as an independent candidate in Pakistan's 2013 elections, tweeted:

3:00am Lahore Hospitals still crowded with blood donors. This is what makes us Pakistan. This is what gives us hope, keeps us going #YouLost — Jibran Nasir (@MJibranNasir) March 27, 2016

On his Facebook page he added a note to this tweet:

Note: This status in no way intends to belittle the loss of precious lives today. I am also not implying that the sudden and tragic loss of lives today was meant to be a sacrifice in the War against terror. Those people didn't want to die and they deserved a peaceful and secure life. I am only acknowledging the response and unity shown today by the people of Lahore who are helping out regardless of religion/sects beings humans first.

Pakistan Taliban splinter group Jamaat-ul-Ahrar claimed responsibility for the attack. A spokesperson from the group told Pakistan's English language newspaper Express Tribune, “We claim responsibility for the attack on Christians as they were celebrating Easter.”

Pakistan has been fighting Taliban-related violence and criminal gang activity for nine years.

While Lahore was dealing with the aftermath of the bombing, in the capital, Islamabad, police fired tear gas at thousands of protesters who marched in support of Islamist gunman Mumtaz Qadri. Qadri was hanged last month for murdering Punjab governor Salman Taseer five years ago. Taseer had defended a Christian woman jailed on blasphemy charges. Pakistani human rights advocates say that Pakistan's blasphemy law is overwhelmingly abused to target Christians.

Lawyer and digital rights activist, Nighat Dad, who lives near the children's park, described scenes of loss, anger and mourning in Lahore, Pakistan's second biggest city known as the City of Gardens.

“Stay strong” “We are resilient” “We will go through this” All sound shallow..seems there is no end to madness #lahoreblast — Nighat Dad (@nighatdad) March 27, 2016

US-based American-Pakistani columnist Rafia Zakaria tweeted:

In Lahore children playing in a park targeted, they have run out of ambulances, over 50 are dead, many dying at the scene #jesuislahore — Rafia Zakaria (@rafiazakaria) March 27, 2016

And Pakistani actress and popular talk show host Nadia Jamil shared an image with one of the victims:

I keep remembering his smile.

It keeps coming back to me.

Oh My wonderful loving gallant friend.

RIP Nomi❤️#Lahore💔 pic.twitter.com/zr6cTZBPbo — Nadia Jamil (@NJLahori) March 27, 2016

Human rights lawyer Mahnoor Rathore wrote: