Two people were killed in police firing as Assam, the hotbed of the protests against the Citizenship (Amendment) Bill , plunged into chaos on Thursday with thousands of agitators descending on streets defying curfew, thumbing their nose at army contingents staging flag marches.

Several towns and cities were placed under indefinite curfew, including Guwahati, the epicentre of protests, besides Dibrugarh, Tezpur and Dhekiajuli. Night curfew was imposed in the Jorhat, Golaghat, Tinsukia and Charaideo districts, officials said. Two people were shot dead by security forces in Guwahati, which has turned into a garrison town with army, paramilitary and police personnel in every nook and corner.

An official of the Gauhati Medical College and Hospital told PTI that one person was brought dead and another succumbed to injuries during treatment. However, protesters claimed that three people had died in police firing. Hospital sources said 11 people were brought there with gunshot injuries.

Incidents of police firing were reported from several places in Guwahati, including Hatigaon, Lachitnagar, Bashishta, Downtown, Ganeshguri and Lalungaon.

Frenzied mobs blocked roads with burning tyres and menaced commuters by bludgeoning their vehicles with sticks and stones.

Narendra Modi appealed for calm and sought to calm protesters, insisting that his government was committed to safeguarding their rights.

In a series of tweets, in both Assamese and English, the Prime Minister said he and the central government were “totally committed to constitutionally safeguard the political, linguistic, cultural and land rights of the Assamese people as per the spirit of Clause 6.”

Clause 6 of the Assam Accord guarantees safeguarding local rights, language and culture.

“I want to assure my brothers and sisters of Assam that they have nothing to worry after the passing of #CAB (sic),” Modi wrote on the microblogging site.

“No one can take away your rights, unique identity and beautiful culture. It will continue to flourish and grow,” he wrote as the state plunged deeper into chaos and violence.

Notwithstanding his words of comfort, internet services in 10 districts were suspended for another 48 hours beginning 12 pm to prevent “misuse” of social media to disturb peace and tranquillity, and to maintain law and order, officials said.

Internet services will remain suspended in Lakhimpur, Dhemaji, Tinsukia, Dibrugarh, Charaideo, Sivasagar, Jorhat, Golaghat, Kamrup (Metro) and Kamrup, additional chief secretary (home and political department) Sanjay Krishna told PTI.

Mobile internet and messaging services were also suspended in neighbouring Meghalaya for 48 hours since 5pm on Thursday after incidents of vandalism of vehicles.

Areas under two police stations in Shillong were placed under curfew.

Although no major incidents of violence were reported from Tripura, Agartala observed a shutdown, with educational institutions and offices closed.

The railways has suspended all passenger train services in Tripura and Assam and cut short long-distance trains to the region at Guwahati following protests in the two states over the CAB, a railway spokesperson told PTI in New Delhi on Thursday.

The decision was taken on Wednesday night in view of the security situation in the region, Northeast Frontier Railway spokesperson Subhanan Chanda said, adding that many passengers were stranded in Kamakhya and Guwahati.

After a railway station in Dibrugarh’s Chabua, the hometown of the Assam chief minister Sarbananda Sonowal, was set on fire late on Wednesday besides the Panitola railway station in Tinsukia, 12 companies of the Railway Protection Special Force (RPSF) have been dispatched to the region, RPF chief Arun Kumar told PTI in the national capital.

“Passengers are stranded and we are trying to help them as much as possible. We are mulling to run special trains to ferry these passengers, but are still weighing if the risk is worth it.

“It might be a security threat for passengers if protesters stop the trains. As of now all passenger trains have been suspended and trains from outside the region are being short terminated at Guwahati,” Chanda said.

An unspecified number of flights to the Northeast, including Guwahati, were rescheduled or cancelled, an official of the Calcutta airport said.

As protests continued, the information and broadcasting ministry issued an advisory to private satellite TV channels to be cautious about airing content that may incite violence, promote anti-national attitudes and contain anything affecting the integrity of the nation.

The advisory was issued after some TV channels showed footage of violent protests.

Heads rolled in the police establishment because of incessant protests with the state’s BJP government removing Guwahati police commissioner Deepak Kumar and appointing Munna Prasad Gupta in his place.

Additional director-general of police (law and order) Mukesh Agarwal was also transferred and replaced by ADGP (CID) G.P. Singh.

The police also opened fire at Madhavdham in Tezpur when a person allegedly belonging to a Hindu right organisation ploughed his vehicle through a group of protesters, injuring four people. Protesters overpowered the man, set his vehicle ablaze and assaulted him, prompting police firing, an official said. RSS offices was vandalised in Amolapatty in Golaghat, besides places like Dibrugarh, Sadiya and Tezpur.

Residences of handloom minister Ranjit Dutta at Behali, and BJP MLAs Padma Hazarika at Sootea and Binod Hazarika in Chabua were also attacked.