Federal agents arrested four men and seized 68 kilograms, about 150 pounds, of methamphetamine in the 4400 block of East Interstate 30 Tuesday afternoon. Drug Enforcement Agency Group Supervisor Sgt. Ruben Felan said the agency received information about a large quantity of methamphetamine concealed in air tanks on an 18-wheeler. “We were able to locate the 18-wheeler. We followed it to that location, where we observed the tanks being removed,” Felan said. “After that, we approached the individuals and we did locate 68 kilos of powdered meth in those air tanks.” DEA agents arrested four men, two from Sulphur Springs. Those arrested included Miguel Angel Diaz-Lua, 43, and Jose Ruiz-Sanchez, 43, both with Sulphur Springs addresses, and Salvadore Del Rio Espinoza 21, of Michigan and Daniel A. Sanchez-Nunez, 24, of California. Raul Reyna in the Dallas County Sheriff's Office said his agency was contacted by the DEA for assistance and provided several officers and at least one canine unit. Investigators and deputies from Hopkins County Sheriff’s Office also took part in the raid. A helicopter that could be seen circling the city Tuesday afternoon was part of the interdiction effort. Felan said the seizure and arrests were part of a much larger ongoing investigation.