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After inspection by local authorities and the Polish space agency, officials determined the object’s identity: a piece of debris from a SpaceX Falcon 9 rocket that had re-entered the atmosphere.

US President Donald Trump has brought in import taxes on dozens of countries since re-entering the White House, although on Wednesday he paused the higher rate on some of them.

Getting them out of orbit means they re-enter the atmosphere, burning up — but not without a trace.

They were then huddled among 50 other passengers and walked back through passport control to re-enter Greece.

Mr O'Dwyer, who was an instructor on the tour, initially exited the river safely, but then re-entered the water in an attempt to rescue the others.