LIVERMORE -- For a second time in less than a month a single-engine plane made an emergency landing in a field about five miles east of the Livermore Municipal Airport, authorities said.

No one was injured in the landing in an open field around Sandia California National Laboratories about 3:30 p.m., authorities said.

A spokesman from the Alameda County Sheriff's Department said the Piper J-3 Cub had electrical issues and made the landing in a southwest buffer zone. The plane is registered to a Yuba City man, according to an FAA spokesman.

The FAA is investigating the cause of the engine problem, a spokesman said. The plane was not damaged, but it may take a couple days for fire officials to remove it, a Sandia spokesman said.

On the evening of April 16, the pilot of a single-engine Cessna 152 made¿ an emergency landing in a field, also about five miles east of the Livermore Municipal Airport after the plane ran out of fuel, an FAA spokesman said. The two incidents are not linked.

Neither of the two people on board were injured and no damage to the plane was reported, the spokesman said. The FAA is also investigating that landing.

Contact Kristin J. Bender at kbender@bayareanewsgroup.com. Follow her at Twitter.com./kjbender.