PORTLAND, Maine (AP) -- Drivers may have gotten a chuckle out of an electronic message board in Maine warning of zombies, but city officials were not amused.

The sign at a Portland road construction site was changed by a hacker to read "Warning Zombies Ahead!" on Wednesday morning. It originally read "Night work 8 pm-6 am. Expect delays."

City spokeswoman Nicole Clegg says the signs are a safety precaution and changing it could have led to driver distraction.

She tells The Portland Press Herald tampering with a safety device is a misdemeanor punishable by up to a year in jail and a $1,000 fine.

She says it's not clear who changed the sign, but it's not the first time it has happened.

Also on HuffPost:

Loading Slideshow...
  • Charles Baker

    While on drugs, <a href="http://www.huffingtonpost.com/2012/06/21/charles-baker-got-naked-ate-flesh-of-jeffery-blake_n_1615800.html?utm_hp_ref=cannibalism" target="_hplink">Charles Baker, 26, of Palmetto, Florida,</a> allegedly got naked, barged into his girlfriend's house, bit a chunk out of a man's arm and ate it, then powered through several cop-deployed Taser probes before getting tackled and arrested.

  • Lowpel Davis

    After trying to steal a wig from the Sassy Beauty Supply Shop in New Haven, Conn., <a href="http://www.huffingtonpost.com/2012/06/08/lowpel-davis-bit-arm-wig-store-owner-spat-flesh-connecticut_n_1581176.html?utm_hp_ref=cannibalism" target="_hplink">Lowpel Davis bit the store owner's arm</a> so hard she took off a piece of his flesh, which she then spat in the man's face, according to cops.

  • Carl Jacquneaux

    Carl Jacquneaux (left) allegedly bit off a chunk of his victim's face while on the synthetic drug known on the street as "bath salts."

  • Rudy Eugene

    This undated booking photo, made available by the Miami-Dade Police Department, shows Rudy Eugene, 31, who was shot and killed by Miami-Dade police after he <a href="http://www.huffingtonpost.com/2012/05/30/new-face-eating-attack-video-miami-rudy-eugene-18-minutes_n_1555653.html" target="_hplink">refused to stop eating another man's face in Miami</a> on May 26, 2012. (AP Photo/Miami-Dade Police Dept.)

  • Luka Rocco Magnotta

    This undated photo, provided by the City of Montreal Police Service's media relations, shows Luka Rocco Magnotta, 29, who is <a href="http://www.huffingtonpost.com/2012/06/01/luka-rocco-magnotta-jun-lin-killed-dismembered-by-porn-actor_n_1562423.html?ref=crime" target="_hplink">suspected of homicide</a>. Montreal police said on May 30, 2012, that they had identified Magnotta as a suspect in a gruesome crime involving severed body parts discovered in packages mailed to Ottawa, Ontario, and in a garbage heap in Montreal.

  • Alexander Kinyua

    Alexander Kinyua, a 21-year-old Morgan State University student, allegedly <a href="http://www.huffingtonpost.com/2012/05/31/alexander-kinyua-kujoe-agyei-kodie-ate-brain-heart-roommate-maryland_n_1560149.html?ref=zombie-apocalypse" target="_hplink">admitted to killing his roommate</a>, Kujoe Bonsafo Agyei-Kodie, and then eating his heart and portions of his brain. Kinyua has been charged with first-degree murder.

  • Mao Sugiyama

    It's not necessarily a crime to eat human flesh. Mao Sugiyama, a self-described "asexual" from Tokyo, had surgery to remove his genitals and then <a href="http://www.huffingtonpost.com/2012/05/24/asexual-mao-sugiyama-cooks-serves-own-genitals_n_1543307.html" target="_hplink">cooked and served them</a> to five lucky dinner guests at a swanky banquet in Japan.

  • Man Accused Of Eating Wife's Lips

    A former employee of a Swedish medical university is accused of <a href="http://www.huffingtonpost.com/2012/06/01/man-eats-wifes-lips-karolinska-institutet-sweden_n_1562776.html?ref=zombie-apocalypse" target="_hplink">cutting off his wife's lips and eating them</a>. The unnamed man allegedly flew into a rage after he became suspicious that his much younger wife was having an affair. A source said the man ate the lips because "he didn't want the lips to be able to be sewn back on."

  • Jaime Vigil

    Vigil is accused of murdering an unidentified person and <a href="http://www.krqe.com/dpp/news/crime/murder-suspect-ate-part-of-mans-face" target="_hplink">eating part of their face.</a> He was arrested in November, 2012 and charged with an open count of murder.