By Joel Schectman And Sara Schaefer Muñoz 

Colombian authorities this week arrested six current and former employees of the state-run oil company Ecopetrol SA, charging them with accepting bribes from the oil services firm PetroTiger Ltd.

The arrests came in a sweep across Bogotá, Bucaramanga, and other cities. Colombian prosecutors allege those arrested accepted bribes from PetroTiger totaling around 2 billion Colombian pesos, or $800,000.

One of those former Ecopetrol employees charged, David Duran, has already been named in a closely watched case against former PetroTiger Chief Executive Joseph Sigelman. U.S. prosecutors allege Mr. Sigelman and other executives at the company paid Mr. Duran $333,500 in bribes funneled through a sham consulting contract to Mr. Duran's wife, Johanna Navarro, in exchange for business from Ecopetrol. Ms. Navarro was arrested and charged this week in Colombia in addition to the other individuals.

Diana Maya, an attorney for Mr. Duran and Ms. Navarro, said her clients are innocent and that the money transferred to Ms. Navarro's account wasn't in return for any favor. Mr. Sigelman maintains his innocence.

The Colombian allegations appear to go beyond those leveled by U.S. prosecutors at Mr. Sigelman, who has only been accused of paying off Mr. Duran.

The arrests come just a month before Mr. Sigelman will go to trial in Camden, N.J., on charges that he violated the Foreign Corrupt Practices Act, which bars bribery of public officials. Because Ecopetrol is a state-owned company, the U.S. prosecutors say Mr. Duran is considered an official under the FCPA.

An Ecopetrol spokesman said the current executives have been suspended and the company is continuing to cooperate with the Colombian prosecutor's office.

An attorney for PetroTiger didn't immediately respond to requests for comment. In a May 2014 letter to PetroTiger, reviewed by The Wall Street Journal, the Justice Department wrote that it didn't intend to prosecute the company. PetroTiger board members reported bribery allegations involving Mr. Sigelman to U.S. and Colombian authorities in 2011, according to people close to the company.

In recent years, U.S. authorities have been cracking down on bribery by U.S. companies. The FCPA doesn't authorize U.S. authorities to bring charges against the foreign officials who take the bribes. But U.S. investigators have been working more closely with overseas law enforcement to help gather evidence needed to prosecute corrupt officials in their home countries. In the PetroTiger case, U.S. authorities have said they have assisted Colombian law enforcement in its investigation, while pressing charges against Mr. Sigelman.

A spokesman for the U.S. Department of Justice declined to comment.

The U.S. case against Mr. Sigelman will test the U.S. Justice Department's new, tougher approach to prosecuting overseas bribery, that uses tools like undercover informants and secret video recordings that are more closely associated with drug crimes than white-collar prosecution. For example, in an attempt to incriminate Mr. Sigelman, Federal Bureau of Investigation agents convinced his former general counsel Gregory Weisman to wear a secret video-camera recording of the former chief executive discussing the allegations. Mr. Weisman has since pleaded guilty to FCPA charges.

Write to Joel Schectman at joel.schectman@wsj.com

and Sara Schaefer Muñoz at Sara.Schaefer-Munoz@wsj.com

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