I'm translating from Spanish:
"MEXICO DF, nov 12 (Reuters) - Experts in aviation accidents from the US haven't found any evidence of sabotage on the Mexican goverment airplane that plummeted down in the capital, costing the life of interior minister ...."
"... As in today, nothing in the DFR, CVR or any other retrieved evidence points to sabotage or criminal activity ..."
"... mexican goverment workers indicated last week there was no evidence of explosives ..."
"... nine people on board and another five that were on the ground were killed ..."
"... Mexico invited experts from the US and the UK in the investigation ..."
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Seems the almost exact spot where it crashed (a couple of office buildings in the city) was also the scenario of a helicopter crash not long ago and a general area of (somewhat) frequent small planes crashes.
No idea of the reasons other than obviously in the approach path of a busy airport.
Seems the airplane was a new and underused Learjet 45 manufactured in 2000 and was put for sale 2003 HB-VMC. The pilot had 30 years of flying experience (over 12.000h).
Mexican CISEN purchased it Apr 2004 with 1595 hours of use (1321 cycles). Original Honeywell TFE 731-20AR-2B engines, serials P111141 (1595 hours) and P111178 (1590 hours).
Several sources indicate that there is no evidence or likely scenario involving sabotage, but no explanation yet as to why the sudden on-the-air nosedive to the ground. Turbulence by the nearby commercial jetliner is a possibility.