Waco, Texas: A deadly weekend shoot-out involving rival motorcycle gangs apparently began with a parking dispute and someone running over a gang member’s foot, police said on Tuesday.

Waco police Sgt. W. Patrick Swanton said an uninvited group appeared for Sunday’s meeting of a loose confederation of biker gangs at a restaurant.

One man was injured when a vehicle rolled over his foot. That caused a dispute that continued inside the restaurant, where fighting and then shooting began, before the melee spilt back outside, Swanton said.

Authorities offered few details. It was not clear which gang was responsible for running over the biker’s foot or which gang the aggrieved biker belonged to.

When the shoot-out was over, nine people were dead and 18 wounded.

Police have said five biker gangs from across Texas had gathered in part to settle differences over turf.

Jimmy Graves, who described himself as an ambassador for the gang known as the Bandidos, disputed that claim, saying the groups had planned to discuss laws protecting motorcycle riders and other topics such as trademarks for club logos.

But he acknowledged that differences with other groups, such as the Cossacks, have been “simmering and brewing.”

Another biker named Johnny Snyder said he was at the restaurant for a quarterly meeting to talk about legislative issues.

Snyder, a long-haul trucker, declined to describe what he saw inside the restaurant, saying he was only concerned with “not getting shot.”

He is vice-president of the Boozefighters Motorcycle Club in Waco, a group that Snyder says does charity events and family gatherings and is not a criminal gang.

About 50 weapons were confiscated, mostly knives and firearms, and Swanton said more than 100 weapons may be found once authorities are done analysing the crime scene at the Twin Peaks restaurant, which is part of a national chain that features waitresses in revealing uniforms.

Preliminary autopsy results showed all nine of the dead were killed by gunshots. Many were hit in the head, neck, chest or torso. Most of the men were in their 40s, but they ranged in age from 27 to 65, according to reports released by a McLennan County justice of the peace.

Police have acknowledged firing on the armed bikers, but it was unclear how many of the dead were shot by gang members and how many were shot by officers.

Of the injured, seven remain hospitalised. Swanton, who has been virtually the sole source of law enforcement information on the fight, described their conditions as stable.

He said the investigation is being hampered by witnesses who “are not being honest with us.”

Police are concerned that the brawl will invite retaliation and more violence, Swanton said.

“We would encourage them to try to be a little peaceful and let the bloodshed stop,” he said.

About 170 bikers have been charged with engaging in organised crime. Swanton said more arrests are likely.

Katie Rhoten, whose husband, Theron Rhoten, was taken into custody, said he told her by phone from jail that he and two other members of a motorcycle club called Vise Grip had just pulled up to the restaurant.

“They got off their bikes, and bullets were ricocheting all around them, so they ducked and ran for cover,” she said in an interview.

When her husband, a mechanic from Austin, and the others went back to retrieve their motorcycles, they were detained by police.

“They were told they were being held for questioning and released, and they sat in the parking lot for three, four, five hours.”

Then, she said, police “changed their mind and arrested everybody on the scene.”

Officers took into custody all sorts of “nonviolent, noncriminal people. I mean they got the Bikers for Christ guys in there.”

In a memo dated May 1, the Texas Department of Public Safety cautioned about increasing violence between the Bandidos and the Cossacks, Dallas TV station WFAA reported Monday.

The department’s Joint Information Centre bulletin said the tension could stem from Cossacks refusing to pay Bandidos dues for operating in Texas and for wearing a patch on their vest that claimed Texas as their turf without the Bandidos’ approval.

“Traditionally, the Bandidos have been the dominant motorcycle club in Texas, and no other club is allowed to wear the Texas bar without their consent,” the bulletin said, according to WFAA.

The bulletin said the Federal Bureau of Investigation had received information that the Bandidos had discussed “going to war with Cossacks.” .

The Bandidos “constitute a growing criminal threat,” the Justice Department said in a report on outlaw motorcycle gangs. The report said the Bandidos are involved in transporting and distributing cocaine and marijuana and in the production and distribution of methamphetamine.