Phoenix ? Police officers in Kansas and four other states have filed lawsuits against Arizona-based Taser International Inc., claiming they were seriously injured after being shocked with the electronic stun gun during training classes.

The suits also include officers from Missouri, Florida, New Mexico and Ohio. All of them have been filed in the past two weeks.

Pete Herring, police chief of the northeast Missouri town of Hallsville, is among those suing.

He claims he suffered heart damage and two strokes when he volunteered to be shocked while hooked up to a cardiac monitor as a way to demonstrate the safety of Taser to his officers in April 2004.

Herring also claims “painful, permanent and progressive” hearing and vision loss and neurological damage in addition to the strokes and cardiac damage.

The plaintiffs in the other four suits claim they were injured in training classes between August 2003 and October 2004. They say that Taser instructors did not reveal any medical information suggesting that the guns could cause injuries and they claim the company has ignored important research suggesting the guns could be extremely dangerous, if not fatal.

The officers claim they suffered “severe and permanent” injuries including spinal fractures, burns, a shoulder dislocation and soft-tissue injuries.

The suits challenge Taser’s principal safety claim and accuse the company of misleading law enforcement about the extent of potential injuries. They also accuse company officials of concealing reports of injuries to at least a dozen other law enforcement officers.

Taser, based in Scottsdale, has marketed the weapons to 7,000 law enforcement agencies and promoted the gun’s safety.

The devices temporarily paralyze people with a 50,000-volt jolt delivered by barbed darts.

The American Civil Liberties Union reports more than 130 deaths in the U.S. related to Tasers, while Amnesty International reports more than 120 deaths in the U.S. and Canada.

Taser International has consistently denied that its products are to blame in the deaths, arguing that none have been directly linked to Tasers.

In a statement Friday, Taser vice president Steve Tuttle said the company planned to “aggressively fight” all the lawsuits.