The UN Human Rights Council will hold a special session on the situation in Syria this Friday announced UN officials.

Fifty-one nations have signed in support of the session, which will address last week’s killing of more than a 100 civilians in Houla.

Speaking on the massacre, the US ambassador to the U.N, Susan Rice, said,

“in the absence of the Assad regime adhering to its commitments suddenly and definitively, the security council and others in the international community will come together and in a unified way to increase the pressure on the Assad regime, including through the use of sanctions..”

Detailing the 'worst case scenario', Rice said,

"none of this happens and the violence intensifies and spills over the region. It heightens sectarian fissures and we in effect have a proxy war which outsiders are supporting the opposition or the government through arms and other means.”

"And members of this council and members of the international community are left with the option only of considering whether they are prepared to take actions outside of the Annan plan and the authority of this council,"

The Houla massacre prompted several nations including the US, UK, France, Germany and Australia, to expel Syrian diplomats on Tuesday.

Just last week a UN panel of independent human rights experts concluded that the government forces were largely responsible for most of the violence unfolding, including the extra-judicial killing and torturing of members of the opposition.