The 10 pastors were detained with their loved ones as they prayed at a church on Sunday in Uttar Pradesh, northern India, following allegations made by Hindu nationalist groups that they had been converting non-members.
Pastor Bahavan Ram was arrested after police burst into his church in Kariyabar in what has been described as a major crackdown on Christianity in the state.
Christian Solidarity Worldwide (CSW) confirmed authorities responsible for the arrests have continued their warped mission and detained a further three more worshippers the following day and even threatened another Christian pastor with jail in a bid to stop him from holding church services.
Mervyn Thomas, chief executive of CSW, told International Christian Concern (ICC): “Recent events in Uttar Pradesh are deeply worrying and indicative of a concerning increase in religious intolerance in India.
“The arbitrary arrests by the police go against the rule of law and we call on the government of India to ensure the release of all pastors currently held in detention, and to work to protect the right to freedom of religion of belief for all Indians, as guaranteed by the Constitution of India and the International Covenant on Civil and Political Rights, to which India is a party.”
Forced religious conversions are considered a crime in some areas of India.
Forcible conversion laws are often used by Hindu radicals as ammunition to launch criminal complaints against Christian leaders.
CSW have since confirmed that police in India were not able to prove Mr Ram had been converting people in the church, and was therefore released.
Yet India remains one of several nations involved in a clampdown on Christians.
In China, Christian persecution remains at its highest level, with ICC claiming authorities have demolished crosses, burned Bibles, raided Christian homes to remove religious symbols, arrested church members and seized churches.
In Egypt, it was reported Christians there have been banned from praying while others have been stabbed by violent mobs who left based in two worshippers heads and faces.
The attack, on August 31, also saw four ransacked, looted and partially set on fire by a Muslim mob during a three-hour-long barrage of violence.
Nineteen Muslims were arrested on charges of charges of “perpetrating unrest and attacking others for allegedly building a church without licence”, Egyptian news outlet Wataninet reports.