OAK CREEK, WI (WTAQ) - A son of the Sikh Temple president who was murdered in Oak Creek said Americans need to learn more about different cultures.

Amardeep Kaleka said on NBC’s “Today” show Monday morning that, “We need to know the nuances, because we live together.”

A gunman killed worshippers just over an hour before the Sunday service was to begin. And then the gunman – who’s reported to be an Army veteran – got into a shootout with police.

Fox News identified the gunman as 40-year-old Wade Michael Page. The gunman wounded an officer before that same officer shot back and killed the gunman.

Autopsies will be performed Monday on the seven dead people.

A mile-long stretch of Howell Avenue in Oak Creek remains closed as the investigation continues.

A motive for the slayings has not been determined, but some Sikh members believe it’s a hate crime. Sikh members say they’re often mistaken for Muslims – and as a result, they say they’ve been wrongly targeted as possible terrorists ever since the 9-11 attacks almost 11 years ago.

According to the New York Times, threats have become so numerous against Sikh-Americans that House Democrat Joseph Crowley of New York wanted the FBI to collect data on hate crimes committed against them.

Crowley chairs the Congressional Caucus on Indian-Americans. He told Attorney General Eric Holder in April that two Sikh men were murdered in Sacramento – a temple in Michigan was vandalized – and a Sikh man was beaten in New York.

A handful of incidents have also been reported against Sikhs in Milwaukee.