MUZAFFARABAD (AFP) — India and Pakistan exchanged heavy artillery fire along their contested frontier on Wednesday after New Delhi launched deadly missile strikes on its arch-rival, in the worst violence between the nuclear-armed neighbors in two decades.

At least 34 deaths were reported, with Islamabad saying 26 civilians were killed by the Indian strikes and firing along the border, and New Delhi adding at least eight dead from Pakistani shelling.

The attack came days after New Delhi blamed Islamabad for backing a deadly attack on the Indian-run side of disputed Kashmir.

The South Asian neighbors have fought multiple wars since they were carved out of the sub-continent at the end of British rule in 1947.

The latest violence exceeds India’s strikes in 2019, when New Delhi said it had hit “several militants” after a suicide bomber attacked an Indian security force convoy, killing 40.

The Indian army said “justice is served,” reporting nine “terrorist camps” had been destroyed, with New Delhi adding that its actions “have been focused, measured and non-escalatory in nature.”

Pakistan Defense Minister Khawaja Muhammad Asif accused Indian Prime Minister Narendra Modi of launching the strikes to “shore up” his domestic popularity, but said Islamabad had struck back.

“The retaliation has already started,” Asif told Agence France-Presse (AFP). “We won’t take long to settle the score.”

Military spokesperson Ahmed Sharif Chaudhry said five Indian jets had been downed across the border.

An Indian senior security source, who asked not to be named, said three Indian fighter jets had crashed on home territory.

The wreckage of one was seen by an AFP photographer at Wuyan, on the Indian controlled side of Kashmir.

‘Shelling raining down’

In Muzaffarabad, the main city of Pakistan-administered Kashmir, troops cordoned off streets around a mosque Islamabad said was hit, with blast marks visible on the walls of several homes.

Pakistan said 21 civilians were killed in the strikes — including four children ­— while five were killed by gunfire at the border.

India’s army accused Pakistan of “indiscriminate” firing across the Line of Control (LoC), the de facto border in Kashmir.

“We woke up as we heard the sound of firing,” Farooq, a man in the Indian town of Poonch, told the Press Trust of India news agency from his hospital bed, his head wrapped in a bandage.

“I saw shelling raining down.”

AFP reporters in the town saw bursts of flame as shells landed.

At least eight Indians were killed and 29 others wounded in Poonch, local revenue officer Azhar Majid told AFP from the town’s hospital.

India had been widely expected to respond militarily to the 22 April attack on tourists in Indian-administered Kashmir by gunmen it said were from Pakistan-based group Lashkar-e-Taiba, a United Nations-designated terrorist organization.

The assault in the tourist hotspot of Pahalgam killed 26 people, mainly Hindu men.

New Delhi has blamed Islamabad for backing the attack, sparking a series of heated threats and diplomatic tit-for-tat measures.

Pakistan rejects the accusations and called for an independent probe.

Prime Minister Shehbaz Sharif ­­— who called India’s strikes a “heinous act of aggression” that would “not go unpunished” — started an emergency meeting of the National Security Committee in the capital Islamabad on Wednesday.

The two sides have exchanged nightly gunfire since 24 April along the LoC, according to the Indian army. Pakistan also said it has held two missile tests.