Students held protests in Anantnag, Baramulla, Awantipora and other parts of the valley as well.
He also added that Singh is playing "politics and inciting trouble".
The teen had accused the MLA of raping her in June past year.
Amrit Wilson, from the South Asia Solidarity Group, said: "We as people of Indian origin in Britain are appalled at the scale of violence Modi's regime has unleashed".
The speakers called upon United Nations, Organization of Islamic Cooperation (OIC) and global human rights organization to play their role in ending gross violation of human rights in Kashmir and in bringing the culprits of war crimes to justice.
Earlier, after the inauguration of the off-campus accommodation for the Government Ayurvedic Medical College Jammu, in the premises of Government Ayurvedic hospital here, Dr Singh in his address congratulated the people of Jammu for getting the gift of Ayurvedic College.
"Some actions are so vile that it becomes necessary for people to come forth and condemn them".
Gurgaon residents marched against the recent rape cases A woman holding a placard during the march Junior Gupta, an activist from the city, took the alternative view, "Retribution does not work".
Security of rape accused Bharatiya Janata Party (BJP) legislator Kuldeep Singh Sengar was withdrawn by the state government on Thursday, an official said.
The two incidents once again revived the demand from some quarters, including the federal minister for Women and Child Development Maneka Gandhi, to reform the law and provide for the death penalty for raping minors. The solution is that we need laws strong enough to tackle this issue and we need to use the Nirbhaya Fund. "We must resist, it is our time to resist and our time to fight back", she said.
Singh said he was thankful that Modi finally broke his silence last Friday over the rape cases and he said the "daughters of India" will get justice and the guilty won't be spared.