In wake of him attending an event of Islamic preacher Zakir Naik in 2012, Congress leader Digvijaya Singh on Thursday said all provocative speeches by Hindus, Muslims, Sikhs and Christians should be banned. \u201cIf the speeches are to be banned.all provocative speeches on religion by Hindus, Muslims, Sikhs and Christians should be banned,\u201d Singh told media here. He said if the Government of India or the Government of Bangladesh has any evidence against Naik's involvement in the ISIS, they should take action against him.\u00a0 Issuing a clarification, Singh said he spoke against religious fundamentalism and terrorism in his speech at the conference organised by Zakir Naik, adding that he had also appealed for communal harmony. \u201cThe conference was for communal harmony and against terrorism. It was also to explain that Islam is against innocents being killed,\u201d he added.\u00a0 Naik is in the midst of a controversy after his \u2018hate speech\u2019 was reported to have inspired one of the five Bangladeshi militants involved to indulge in the July 1 terror attack on an upscale cafe in Dhaka\u2019s Gulshan suburb. The video shows Digvijay Singh saying that people like Zakir Naik can bridge the gap between Hindus and Muslims. \u00a0 \u201cZakir should travel all over India\u2026I am very happy that he is spreading the message of peace,\u201d he said. \u201cWe need your message to reach the country,\u201d Singh had told Zakir Naik back then. The office bearers of his organization \u2018Islamic Research Foundation\u2019 in Mumbai\u2019s Dongri are being questioned by a team of the Mumbai Police.\u00a0 Zakir Naik is reportedly in Saudi Arabia for a religious pilgrimage and would return to India on July 11. He will be addressing a press conference the next day to respond to the allegations against him for which he has hired a Mumbai based PR agency.