Story highlights Syrians in eastern Aleppo share "goodbye" messages as government forces close in

Aleppo activist says he has given up on international community

(CNN) Syrians in eastern Aleppo are sharing desperate "goodbye" messages as government forces close in on the ever-shrinking rebel-held enclave.

Thousands of civilians remain trapped amid what has been described by a UN spokesman as a "complete meltdown of humanity."

"This may be my last video. More than 50,000 civilians who rebelled against the dictator [Syrian President Bashar] al-Assad are threatened with field executions or are dying under bombing," Lina Shamy, an activist in eastern Aleppo, said in a video shared on Twitter.

Syrian regime forces have seized much of eastern Aleppo, which has been held by rebels for four years. In their final, bloody push to retake the city, there are multiple reports that pro-government forces have carried out mass executions.

CNN has not been able to independently verify the execution reports, and the Syrian government did not comment on the killings in state-run media.

the last massage. Thanks for everything. we shared many moments. The last tweets were from an emotiomal father. Farewell, #Aleppo — @Mr.Alhamdo (@Mr_Alhamdo) December 12, 2016

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