Philadelphia's police commissioner on Saturday defended officers who arrested two black men at a Starbucks, prompting accusations of racism on social media, concern from the mayor and an apology from the company.

Videos posted online show officers handcuffing the men in the downtown establishment on Thursday. A white man in the video is heard saying he was meeting with the men and calls the arrest "ridiculous."

Commissioner Richard Ross said Starbucks employees called 911 to say the men were trespassing. He said officers were told that the men had come in and asked to use the restroom but were denied because they hadn't bought anything, as he said is company policy. He said they then refused to leave.

Ross, who is black, said police asked the men to leave three times but they refused, and they were then arrested but were later released after the company elected not to prosecute. He said the officers "did absolutely nothing wrong" and were professional in their conduct toward the individuals but "got the opposite back." He did not mention the person who said he was meeting with the men.

"As an African American male, I am very aware of implicit bias; we are committed to fair and unbiased policing," Ross said. But he added "If a business calls and they say that 'Someone is here that I no longer wish to be in my business' (officers) now have a legal obligation to carry out their duties and they did just that."

saying the company was "disappointed this led to an arrest" and was reviewing its policies.

"We take these matters seriously and clearly have more work to do when it comes to how we handle incidents in our store," the company said in a statement Saturday afternoon.

Ross said he doesn't patronize Starbucks but recalled an incident from a few years ago in which a uniformed sergeant was denied access to a Starbucks bathroom "so they are at least consistent in their policy."

Mayor Jim Kenney said he asked the city Commission on Human Relations to examine the company's policies and procedures "including the extent of, or need for, implicit bias training for its employees."

"I am heartbroken to see Philadelphia in the headlines for an incident that -- at least based on what we know at this point -- appears to exemplify what racial discrimination looks like in 2018," Kenney said in a statement.

Kenney said a review promised by police of policies in similar situations "is fully warranted given the unfortunate outcome of this event, particularly at a time when our criminal justice reform efforts are focused on avoiding needless incarcerations."

Attorney Lauren Wimmer told The Philadelphia Inquirer that the men, who she did not identify, were commercial real estate professionals and were meeting with the another man to discuss business. She identified herself as a friend of the man they were meeting with.

A spokesman for the district attorney's office said the two black men were released "because of lack of evidence" that a crime had been committed, but declined further comment, citing a police investigation.