'Pilot' with 'Latino roots' detained in Táchira, border with Colombia, in the last few days, President Nicolas Maduro claims

5 other U.S. nationals and 4 missionaries have been detained recently

All accused by Venezuelan government of 'espionage' and 'recruitment' 

Comes as tensions rise between the two nations, Maduro accused the U.S. of trying to overthrow him 

There has been a recent surge in anti-government protests in Caracas