OAK CREEK, Wis. (AP) — The man who opened fire in a Wisconsin Sikh temple posted frequent comments on Internet forums for skinheads, repeatedly exhorting members to act more decisively to support their cause.

A day after Wade Michael Page’s attack, authorities were trying to determine why the 40-year-old Army veteran targeted total strangers in a house of worship.

Detectives cautioned they might never know for sure. But the picture of Page that began to develop suggested he was a white supremacist who wanted to see his beliefs advanced with action.

Page, who was shot to death by police, described himself as a member of the “Hammerskins Nation,” a skinhead group rooted in Texas that has branches in Australia and Canada.