Inaugurating the three-day annual DGPs/IGPs conference here, Singh said elections will be held in some states soon and it is the responsibility of police chiefs to ensure peaceful completion of the poll process.
"We have to keep strict vigil against external extremist elements who may try to create disturbance in Punjab. There have been increased activities of the Sikh terrorists in recent months.
"Similarly in Manipur, we have to ensure peace keeping in mind the ethnic divide. In Uttar Pradesh too, there may be attempts to disturb law and order through vicious political campaigning. We have to keep strict vigil and take proper steps to ensure peace during elections," he said.
The conference is being attended by around 100 Directors General of Police and Inspectors General of Police of states and UTs and heads of central police organisations at the Sardar Vallabhbhai Patel National Police Academy here.
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Maintaining that threats of self-radicalisation and lone wolf attacks have been increasing, the Home Minister said there was no let up in Pakistan's support to terror and anti- India activities.
"We all know that a neighbouring country has been trying to instigate people in northern parts of the country to indulge in anti-India activities, providing training to terrorists and sending them to India to carry out in terror attacks. Despite all these efforts, the credit for maintaining peace in the country goes to security and intelligence agencies," he said.
The Home Minister said the decision to demonetise Rs
1000 and Rs 500 notes has badly hit terrorists, naxals and other undesirable elements.
"We are confident that demonetisation will help in curbing the activities of extremists and anti-nationals to a great extent. We have to defeat the attempts by the naxals to convert the old Rs 1000 and Rs 500 notes through local contractors, businessmen and sympathisers," he said.
Talking about the situation in Jammu and Kashmir, the Home Minister said the state has been affected by unrest due to a "Pakistan-sponsored conspiracy" following the killing of Hizbul Mujahideen militant Burhan Wani on July 8.
"No country can accept any kind of violence perpetrated by the terrorists. This is being sponsored and inspired from across the border.
"When I went to Pakistan in August to attend a SAARC conference, I asked Pakistan how come one country's terrorist becomes another country's martyr or freedom fighter. But no one in Pakistan dared to reply to my question. Now the situation in the state has improved significantly," he said.
"This is the reason why the separatists, with help from the neighbouring country, were trying to create disturbance in the state so that development gets hampered and people of the state, particularly the youth, are misled about India," he said.
The Home Minister said separatists and their supporters in Pakistan are not being able to digest the success of the PDP-BJP coalition government in Jammu and Kashmir and the development activities being carried out by it.
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Referring to the surgical strikes carried out by the Indian Army against terror launch pads in PoK, the Home Minister said by carrying it out, India has sent a message to everyone that its patience should not be considered misconstrued as weakness and its armed forces are capable of taking out the enemy anywhere and anytime.
Singh said cyber threat to the country has been increasing and attempts are being made to divide the society and create tension among communities through social media.
Talking about the Maoists, the Home Minister said Naxals are in retreat and now confined to a limited area.