The BJP is observing “Black Day” in West Bengal and a 12-hour shutdown in North 24 Parganas district’s Basirhat subdivision on Monday to protest the killing of its workers and the “deteriorating” law and order situation in the state.

The saffron party took out rallies in several parts of the state, with BJP workers supporting black badges.

The BJP took out protest rallies in the district subdivision, demanding immediate arrest of the culprits involved in the killings of its workers.

A huge contingent of police personnel has been deployed in the area to avoid any untoward incident, police said.

BJP workers squatted on roads and railways tracks at many places in the subdivision, disrupting the movement of vehicles and trains.

Four people had lost their lives in post-poll clashes in Bhangipara, Hatgacha in North 24 Parganas on Saturday.

The BJP had on Sunday accused the TMC workers of killing three of its workers during the clashes that broke out on Saturday in the Najat area of Basirhat’s Sandeshkhali.

Workers of BJP and TMC had clashed over taking off party flags, leading to injuries on both sides. Besides three BJP workers, one TMC supporter was also reportedly died.

Several BJP workers and police personnel were injured on Saturday after clashes broke out between the two sides over a victory rally being taken out by the saffron party at Gangarampur area of North Dinajpur district.

Chief Minister Mamata Banerjee had on Thursday said victory rallies will not be allowed by any party in West Bengal, including that of the ruling Trinamool Congress.

Meanwhile, the last rites of two BJP workers, who were killed in clashes in West Bengal’s Sandeshkhali area on Saturday, were performed in their native village on Sunday after the saffron party was denied permission to take their mortal remains to Kolkata, a state BJP leader said.

Following reports of violence from the state, the Centre expressed deep concern over the continuing violence in West Bengal even after the conclusion of the Lok Sabha polls and issued an advisory to the State Government on Sunday.

In response, the West Bengal government claimed that the clashes were perpetrated by “some anti-social elements”.

The Trinamool Congress further accused the Bharatiya Janata Party of “using the Home Ministry for political conspiracy”.