"Pokemon Go" servers were hacked by PoodleCorp, the group who is also responsible in hacking some Youtubers' accounts. In New York, the cause of "Pokemon Go" Stampede was the appearance rare pokemonster.

A username XO, the online user who claimed that he or she is the leader of the group of hackers, retweeted PoodleCorp's post, with a caption, "Just was a lil test, we will do something on a larger scale soon."

The hacker was able to take down "Pokemon Go" servers using DDos or, Distributed Denial of Service. This is not their first time to hack such popular sites. Recently, they hacked high profile YouTubers such as Pewdiepie and a video content producer, Watch Mojo, according to Gearnuke.

It is not clear if PoodleCorp is also responsible in taking down the online gaming platform, Steam. On Sunday, July 17, Steam was also appeared down worldwide, however, after 20 minutes, it went back to normal, according to Attack of The Fanboy.

Back to "Pokemon Go", its servers had some technical issues in July after it has been launched. According to some players, the app kept on crashing while they were playing.

On Thursday, July 14, there was a stampede in Central Park, New York, as someone said that there Vaporeon appeared in the area, thus making players rush to catch this virtual creature.

In a video uploaded in Vimeo, which was filmed by a fellow "Pokemon Go" players, at 11 p.m., Thursday, a man went out of his car and joined the crowd to capture the pokemonster.

Vaporeon is a water-type pokemon, and it evolves from Eevee. Players are rushing to catch the Vaporeon because Eevee, a normal-type pokemon, is uncommon to "Pokemon Go", and its evolutions in the wild are even more rare, according to Comic Book.

There were accidents reported that involved playing "Pokemon Go" in July. On Friday, July 15, a man crashed his car into a tree in New York. He admitted to the authorities that he was playing the "Pokemon Go."

On Thursday, July 14,  two men in San Diego fell off a cliff as they climbed over the fence in attempt to catch pokemonster.