There are not thought to be further possible options open to Assange through the UN, after the UK and Sweden categorically rejected a finding by a UN working group that the Australian’s time in the embassy, where he first sought asylum in July 2012, amounted to “arbitrary detention” (The Guardian.)
Is "are not thought to be" a catenative construction? And if so, how should it be understood in the context above?
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"There are not thought to be ..." is a passive form of "People do not think that there are ..."