Mexico City suffered on Friday the sixth bomb attack in a month on local commercial property, as a branch of Banamex was struck by a home-made butane gas bomb at 2.30 a.m. local time, a senior official said.

Unknown bombers have attacked four banks, one auto showroom and one upscale clothing store since the start of the month.

Friday's explosion caused no injuries, but damaged the glass, ceilings and partitions of the bank branch located on the southern outskirts of the city, said Genaro Vasquez, deputy director in charge of evidence gathering at the Mexico City State Prosecutors' Office (PGJDF).

PGJDF's forensic investigators found four butane cylinders and small quantities of gunpowder and adhesive tape on the scene. The same remains were found at the scenes of the five previous bombings.

Vasquez described the attacks as vandalism targeting the banking infrastructure but not the civilian population, adding that messages found at one scene suggested the attacks were carried out by "anarchist types." The same messages were published hours later on the Internet, confirming their authenticity, he noted.

He said the attackers claimed the bombing campaign was a protest against food and clothing industries, which they said torture animals, and against capitalism which creates inequality.

Vasquez added that the bank's closed circuit television had caught the images of two to three people carrying the home-made bombs. Police also believe that the notes left on the scene were written by someone with higher education background, judging from the vocabulary used.

Source:Xinhua