The FBI asked Wednesday for the public’s help in locating terrorism suspect Ahmad Abousamra, a former Mansfield resident who allegedly traveled to Pakistan and Yemen to be trained in how to kill American service members overseas.

Abousamra was indicted in 2009 along with Tarek Mehanna, a Sudbury man who was sentenced this year to 17½ years in federal prison following his conviction on charges of providing material support to Al Qaeda, including translating terrorist documents into English.

The FBI is offering a $50,000 reward for information leading to Abousamra’s capture.

“Based on a variety of investigative and operational factors, we’ve decided that now is the time to launch our global campaign,” said Richard DesLauriers, special agent in charge of the Boston division of the FBI.

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According to the FBI and the indictment on file in US District Court in Boston, Abousamra made multiple trips to Pakistan and Yemen seeking training at terrorist camps during the past decade. The FBI said he also journeyed to Iraq, allegedly with the hope of participating in attacks on the US military.

In 2010, Abousamra and Mehanna were charged in a superseding indictment with a single count of conspiring to provide material support to Al Qaeda.

Abousamra, 31, is of Syrian descent and has dual citizenship in the United States and Syria, the FBI said. He was born in France and is now believed to be living in Aleppo, Syria, with his wife, at least one child, and other relatives, authorities said.

DesLauriers said the publicity campaign was launched in hopes of finally ending Abousamra’s years on the run. He fled the United States in 2006 after being questioned by federal investigators about his overseas trips.

“Conspiring to use force or violence to achieve a political or social goal violates our cherished ideal of peaceful dissent. Our goal is to find and arrest Abousamra so he can be tried by a jury of his peers,” Des­Lauriers said in a statement.

Abousamra is fluent in both English and Arabic and has a college degree in computer technology, the FBI said.

His known aliases include Ahmad Abou-Samra, Ahmad Abou, Ahmad Abou Samira, Ahmad Samra, Ahmad Abu Samra, and Ahmad Abou Samra.

The FBI also released a video, a voice clip, and wanted posters in English, French, and Arabic to help in the search.

Anyone with information is asked to contact the FBI by calling 1-800-CALL- FBI or 617-742-5533, via the Internet at https://tips.fbi.gov, or by calling their local FBI office, or the nearest US embassy or consulate.