Reported hate crimes against Muslims rose in 2015 to their highest number since the aftermath of the Sept. 11, 2001, terrorist attacks, according to FBI statistics released Monday.

Overall, the total number of hate crimes against all groups reported by law enforcement agencies to the FBI increased from 5,479 in 2014 to 5,850 last year. That remains far lower than the numbers seen in the early 2000s.

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The most recent reporting covers calendar year 2015, which included the terror attacks in Paris and San Bernardino, Calif., as well as Republican Donald Trump's call for a ban on all Muslims entering the U.S. All of those, however, did not occur until the final two months of the year.

It's not yet known whether Trump plans to implement such a ban now that he has won the presidency. Critics say his pledge has contributed to anti-Muslim sentiment.

"We've seen how words from public figures like Donald Trump translate into violence," said Mark Potok with the Southern Poverty Law Center, which tracks hate groups in the U.S.

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Last year, there were 257 reported incidents of anti-Muslim bias compared to 154 the year before, a 67 percent increase. The number of reported hate crimes against Muslims peaked at 481 in 2001.

Ibrahim Hooper, spokesman for the Council on American-Islamic Relations, said he was not surprised to see the large increase in 2015 and said he expects the trend to continue.

"We saw a spike in anti-Muslim incidents nationwide beginning toward the end of 2015. That spike has continued until today and even accelerated after the election of President-elect Trump," Hooper said.

According to the FBI report, the majority of hate crimes were motivated by bias against race or ethnicity. Of the 4,216 victims of a hate crime motivated by race or ethnicity, 52 percent were black, 18.7 percent were white and 9.3 percent were Hispanic or Latino. Crimes against Jews increased about 9 percent, while bias incidents involving sexual orientation were up 3.5 percent.

Civil rights groups have expressed concern that a Trump administration could radically reshape the U.S. Department of Justice, particularly when it comes to policing but also in terms of the priority placed on hate crimes. Those concerns were compounded over the weekend after Trump named as his chief White House strategist Steve Bannon, who came to his campaign from Breitbart News. Under his leadership, the Breitbart website became one of the leading outlets of the so-called alt-right, a movement often associated with far-right efforts to preserve "white identity" and oppose multiculturalism.

Michael Lieberman with the Anti-Defamation League said there have been "unprecedented efforts" to address hate crimes in recent years, from outreach to law enforcement, community meetings and an emphasis on cooperation among federal agencies.

Any increases, including the ones seen in anti-Muslim crimes, could be due in part to more reporting by victims as well as better reporting and tracking by law enforcement agencies. The number of law enforcement agencies sending data on hate crimes to the FBI decreased by about 3 percent in 2015.

An AP investigation earlier this year found 17 percent of local law enforcement agencies had not submitted a single hate crime report during the past six years as part of the FBI's tracking program, prompting concerns that an undercount was masking the true scope of hate and bias crimes in the U.S.

"Gaps in participation and incomplete reporting demonstrate materially that this work must continue, and we will be pressing the Trump Justice Department and U.S. attorneys so this important work will be ongoing," Lieberman said.