BOSTON — The Boston Celtics were expected to come to terms with free-agent big man Al Horford on a new deal after he opted out of the final year of his contract on Tuesday, according to multiple reports.

But according to The Boston Herald on Tuesday evening, Horford is no longer discussing a new deal with the Celtics and he expects to sign a four-year deal with another team.

The Celtics have not exactly had the offseason Danny Ainge envisioned as recently as a year ago, with Kyrie Irving and Anthony Davis putting together the core of a championship contender. Irving is reportedly focused on the Brooklyn Nets, and Davis – after an entire season spent warning off the Celtics – was finally dealt to the Los Angeles Lakers over the weekend.

But Boston was expected to keep Horford around, building with the core that made the Eastern Conference finals in 2018 – Horford, Jayson Tatum, Jaylen Brown, Marcus Smart and others, adding Gordon Hayward to the mix. Instead, it appears Boston will go in a completely different direction.

Whether that direction was chosen by Horford looking at the Celtics’ landscape and realizing he could contend better elsewhere, or by Danny Ainge telling Horford he intends to go some sort of rebuild remains to be seen.

Horford was one of Boston’s steadiest players throughout, averaging 13.9 points and nine rebounds in the postseason.

RAPTORS: Police are looking for a fourth person and haven’t recovered the gun involved in a shooting at a rally for the NBA champion Raptors that wounded four people and sent thousands fleeing, authorities said.

Toronto Police Chief Marc Saunders said they are looking for a male who was wearing a white button down T-shirt at Monday’s shooting at city hall square, less than a block from where the players and Prime Minister Justin Trudeau sat on stage.

Police arrested three people who are now facing firearm charges, but the shell casings at the scene didn’t match two guns seized. Shaquille Anthony Miller, 25, Abdikarim Kerow, 18, and Thaino Toussaint, 20 have been charged and made brief bail hearing appearances on Monday.

Droves of Raptors fans stampeded from the site. Those wounded by the gunshots didn’t suffer life-threatening injuries.

Investigators did not discuss a possible motive.

Hordes of fans jammed downtown Toronto for Monday’s parade, raising concerns about safety, lack of proper barriers and overcrowding as the city celebrated its first major sports title in more than a quarter-century. The parade ran three hours behind schedule as the team’s double-decker buses had trouble getting through the throngs.

Mayor John Tory said the team owner and the city only had “three days” to prepare for the parade. Tory said the city’s manager will work with police and the city’s sports teams to review the parade to see how they can improve on it.

• A deputy suffered a concussion and is on medical leave after an altercation with the president of the Raptors as he tried to join his team on the court to celebrate their NBA championship, a lawyer said.

The 20-year-veteran of the Alameda County Sheriff’s Office also has a serious jaw injury and is considering filing a lawsuit against Raptors President Masai Ujiri, attorney David Mastagni said.

“The officer is off work, disabled and wants to go back to work,” Mastagni said. The name of the deputy has not been released.

The clash between the deputy and Ujiri happened as the deputy checked court-access credentials after the game Thursday in Oakland against the Golden State Warriors.

Authorities say Ujiri tried to walk past the deputy but the deputy stopped him because he didn’t see Ujiri’s on-court credentials.

Ujiri pushed the deputy, who pushed him back before Ujiri “made a second, more significant shove and during that shove his arm struck our deputy in the side of the head,” sheriff’s Sgt. Ray Kelly said. He said Ujiri also shouted obscenities.

Several bystanders intervened and Ujiri got onto the court without displaying any credentials, Kelly said.

• Kawhi Leonard  the two-way star and two-time NBA finals MVP, still isn’t saying where he will play next season.

Leonard spent several days partying with his teammates in Las Vegas and Los Angeles after last Thursday’s Game 6 clincher, returning to Toronto in time to ride in one of five open-top double decker buses that carried the Raptors along a crowded parade route.

Leonard is expected to decline the player option on the final year of his contract and become a free agent. Toronto can offer him a five-year deal worth around $190 million, one year and some $50 million more than any other team.

STUDY: A diversity report shows the NBA still leads men’s professional sports leagues in racial and gender hiring practices.

The annual report card from The Institute for Diversity and Ethics in Sport (TIDES) at Central Florida indicated almost identical scores from last year. The grade for racial hiring was an A-plus with an unchanged 98.7 score. The grade for gender hiring was a B, but slid slightly to 80.9.

The overall grade was an A at 89.8. That was better than Major League Soccer’s B-plus, the NFL with a B and Major League Baseball with a B-minus. The NHL doesn’t participate in the study.