The attack compounded a tense weekend in Michoacan after self-defence forces seized another town, buses were burned and their most prominent leader was injured in a plane crash.
The soldiers were on patrol Sunday on a road leading to the city of Apatzingan when they shot back at the unidentified assailants, Michoacan's chief prosecutor Marco Vinicio Aguilera Garibay told AFP yesterday.
"Two soldiers died in an attack by an armed group whose whereabouts are unknown," he said.
The state's most prominent vigilante leader, Jose Manuel Mireles, was hurt in a plane crash late Saturday.
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The 55-year-old doctor suffered a head injury and dislocated jaw when the small plane made an emergency landing as he returned home from the Jalisco state city of Guadalajara.
A man died and three other people were injured in the crash, which took place hours after vigilantes seized the town of Paracuaro and disarmed a dozen local police officers.
Mireles, meanwhile, was transferred in a police Black Hawk helicopter to an undisclosed hospital in Mexico City on Sunday for security reasons, federal officials said.
Authorities are investigating the crash but state prosecutors said the plane was forced to land due to a mechanical failure.
Officials said Saturday that Mireles was stable and conscious but there have been no new reports of his health since then.
Another vigilante leader, Hipolito Mora, told AFP yesterday that Mireles' injury would not stop the movement and that Apatzingan, the economic heart of the lime-producing region, remained a target.
"The doctor is a very important person for the movement but there are other people behind it," Mora said.
"(The Templars) are irritated. They don't want the self-defense groups to spread because they had got used to dominating everything," he said.