Police took to social media and used loudhailers to tell residents to stay indoors and away from windows.
“It is about the suspicion of preparing a bomb attack,” said local police.
Al-Bakr, who was born in Damscus, came to Europe from the Syrian town of Sasa. His alleged target in Germany was reported to be a regional airport, possibly Dresden or Leipzig.
It emerged today that he had walked past police officers preparing to storm his Chemnitz home at 7.04 am on saturday without them noticing.
The foiling of the plot came weeks after German intelligence officials said there were at least 520 suspected IS terrorists among the waves of refugees waiting to strike.
Fear of terrorists hiding out among the migrants have caused Chancellor Angela Merkel’s approval ratings to plummet, with the anti-immigrant Alternative for Germany (AfD) party enjoying a string of successes in recent regional elections.