A labourer critically injured in the attack in south Kashmir's Kulgam district has succumbed to his injuries, taking the death toll in the incident to six, police said on Wednesday.

Five migrant labourers from West Bengal were shot dead by suspected militants in Kulgam district on Tuesday. The labourer, who succumbed to his inuries, was critically injured in the incident, police said.

All the victims hailed from Murshidabad district of West Bengal, the police said.

The attack happened at a time when a delegation of parliamentarians from the European Union is in Kashmir to talk to locals and ask them about their experience after the abrogation of Jammu and Kashmir's special status under Article 370 of the Constitution.

Earlier, West Bengal chief minister Mamata Banerjee expressed shock and grief over the incident and said that all help will be extended to the families of the five workers from Murshidabad district who were killed in the attacks in Kashmir.

'We are shocked and deeply saddened at the brutal killings in Kashmir. Five workers from Murshidabad lost their lives. Words will not take away the grief of the families of the deceased,' Banerjee wrote on her Twitter handle.

'All help will be extended to the families in this tragic situation,' she added.