Newton Public Schools will remain closed on Friday as an ongoing strike by the teachers union canceled classes for a sixth day.

“The day did not end on a positive note and school is canceled once again (Friday),” Newton school committee chair Christopher Brezski said.

Emotions appeared high within the Newton Teachers Association Thursday night as leaders held a news conference, announcing where negotiations stood.

The teachers union expressed frustration about how the Newton school committee was approaching negotiations with them.

“The biggest sticking point is that the Newton School committee refuses to bargain with us,” Michael Zilles, the president of the Newton Teachers Association, said. “They are playing a game of wait it out, wait it out. Wait it out. That’s the biggest sticking point. There is nothing in particular that we are fighting over that we couldn’t reach agreement on.”