Teachers' Strike Looms

City officials are preparing for a possible teacher strike Thursday that could mean no school for the city's 58,000 public school students.

Among the steps being taking: extended hours at community centers and libraries, and additional staff.

Boston Teachers Union spokesman Stephen Crawford says the main obstacle in contract talks with the city has been a proposal to increase class sizes.

"That's just not something teachers are willing to accept because they know how long its taken to get those numbers down and know how many kids truly struggle in the classes that exist today."

WBUR's Bianca Vazquez Toness reports.