US spy planes hunt for intel on Mexican drug cartels as surveillance flights surge near border

The US military has significantly increased its surveillance of Mexican drug cartels over the past two weeks, with sophisticated spy planes flying at least 18 missions over the southwestern US and in international airspace around the Baja peninsula, according to open-source data and three US officials familiar with the missions.

​ The US military has significantly increased its surveillance of Mexican drug cartels over the past two weeks, with sophisticated spy planes flying at least 18 missions over the southwestern US and in international airspace around the Baja peninsula, according to open-source data and three US officials familiar with the missions. Read More Breaking News, Latest News and Videos | CNN