The United Nations said the LRA is suspected of massacres in regional villages and is notorious for its use of child soldiers. The world body said since 2004, however, only remnants of the group remain.
Senior officials from the United Nations and African Union arrived in Chad last weekend to warn the government of possible LRA resurgence.
"The current pressure against LRA rebels could lead them to organize an incursion into other countries," the U.N. Regional Office for Central Africa said in a statement.
Joseph Kony, the leader of the LRA, remains at large despite a 2005 indictment by the International Criminal Court on more than 30 counts of violations of international law, including war crimes.
The White House announced this week that U.S. military advisers would be deployed in Uganda to help track down members of the Lord's Resistance Army.
"This is part of our regional strategy to end the scourge that is the LRA and help realize a future where no African child is stolen from their family, no girl is raped and no boy is turned into a child soldier," U.S. President Barack Obama said in a statement.