Authorities arrested the leader of a gang believed responsible for a string of threats and attacks on bus drivers that has disrupted public transportation in El Salvador's capital, prosecutors said Wednesday.

The Attorney General's Office said Cesar Vladimir Montoya Climaco, a leader of the Barrio 18 gang, was captured Tuesday night in a suburb north of San Salvador.

Bus routes across the city have been disrupted this week by a series of violent attacks and threats against those who continue to drive their routes. Since Sunday night, nine drivers have been killed. Authorities confirmed Wednesday that the latest victim, a 21-year-old driver, was killed while filling his vehicle with gasoline.

The reason for the attacks is unclear. Powerful gangs have extorted bus drivers in the past.

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This story has been corrected to show the suspect's name is Montoya.