Sentencing was delayed Thursday for a Dorchester man who pleaded guilty to setting four arson fires, because he might be responsible for starting six additional blazes, a US District Court Judge said.

At the start of Thursday’s sentencing hearing for Jose L. Baez, Judge Douglas P. ­Woodlock said that he is obligated to consider the six additional arsons in Roslindale, ­Jamaica Plain, Lawrence, and Cambridge that investigators linked to Baez, though he was never charged in those fires.