At least 14 people died and 80 are injured are up until now, the result of a strong blast that shook the state-owned company Mexican Petroleum (Pemex) on Thursday January 31st, 2013 in Mexico City, as it was informed by the company's official Twitter account:
@pemex  [es]: Lamentablemente se tienen confirmados al momento 14 personas fallecidas y 80 lesionadas
@pemex: Unfortunately, we have 14 persons confirmed dead and 80 injured
Some netizens, besides regretting the news, speculated on the true cause of the explosion. Like Think Mexican (@ThinkMexican ), who pointed out on its Twitter account:
Or the journalist and writter Raúl Tortolero (@raultortolero1 ), who asked:
@raultortolero1: Will we know with transparency what happened in #Pemex today, or are we only going to hear made up versions?
While other like Ana (@AnaLargaespada ) spoke about possible negligence:
@AnaLargaespada: #Pemex facilities had already had 2 explosions http://www.eluniversal.com.mx/notas/899965.html …  (watch video). This sounds to me like misshandling
And some others think it was the responsibility of the drug lords, like Jorge said (@TwytterMx ):
@TwitterMx: The explosion at #Pemex headquarters same as the blast in #Reynosa are terrorist acts by drug gangs! #atendato (attack)
To which Huff Post Voices columnist Alejando Escalona (@alexoescalona ) concluded:
@alexoescalona: I think it is good not to speculate if what happened in Pemex was an attack, but we shouldn't either asume it was an accident. #PEMEX
On the other hand, there were tasteless comments that many reacted to, like movie maker and columnist Mariano Bouchot (@marianobouchot ), who disapproved the jokes on the subject:
@marianobouchot: I don't understand nor justify the jokes around the tragedy. What happened today in #Pemex is not a jest.
There were also many netizens who spread useful information. Like, Fherb (@LFernando24 ) who tweeted:
@LFernandoo24: Help please: Blood donors needed at Pemex North Central Hospital in Azcapotzalco… #Pemex
And Maru Iniestra (@889Maru ) shared a link with a report of the wounded:
@889Maru  [es]: Pasen la voz… Reporte preliminar de heridos
#Pemex http://www.presidencia.gob.mx/informacion-de-contingencia-de-pemex/ …  Más información en @locatel_mx  #LocatelInforma  56581111
@889Maru: Spread the word… Preliminary report of the wounded #Pemex http://www.presidencia.gob.mx/informacion-de-contingencia-de-pemex/ …  More information in @locatel_mx #LocatelInforma (Locatel Informs) 5658111
While a great number of netizens offer their condolences to the families of those who lost their lives, as the economist and blogger Guillermo Barba (@memobarba ):
@memobarba: There's no doubt this blast at the #Pemex Tower was a tragedy. My condolences to the victims’ families.
Pemex web page  already a black ribbon as a mourning sign.
News are still developing as this post was published.