SALEM – A Superior Court judge Monday continued $100,000 cash bail for a man suspected of a committing a string of knife-point robberies in Lynn, Salem and Beverly during an 11-day crime spree, after pleading innocent.Federico Arroyo, 25, of 71 Tibbetstown Way, Charles-town, entered his plea of innocent to four counts of masked armed robbery and four counts of armed robbery in connection with eight holdups that began in late December.At the joint recommendation of the prosecutor and defense, Judge David A. Lowy set the high bail, but the defense may seek a bail review at another court date.In the meantime, Arroyo remains held in custody in lieu of bail at the Middleton Jail.On Dec. 22, Arroyo allegedly robbed cash and Marlboro cigarettes at knifepoint and masked from the Lynn Convenience Store at 109 Western Ave., in Lynn.The next day, wearing a mask, he apparently stole cigarettes and cash again from the Quick Mark, at 10 Jefferson Ave., in Salem.Then on Christmas Day, police say he robbed cash from Tedeschi Food Store at 52 Cabot St., in Beverly.Three days later, on Dec. 28, he is charged with stealing Marlboro cigarettes and cash again at knifepoint from the Shell Gas Station, at 129 Brimball Ave., in Beverly.Then on the following day, he is accused of stealing cash from One Stop Market, at 311 Cabot St., in Beverly.Two days later, Dec. 31, he allegedly robbed money from a 47-year-old female delivery woman on Baker Street in Lynn, while armed with a knife and masked.On New Year’s day, authorities say he stole money from the 99 Market, at 99 Essex St., in Lynn and on Jan. 2 he robbed cigarettes and cash from Waylos Variety located at 20 Essex St., in Salem.Police arrested Arroyo the next day at a home in Gloucester.In all 11 robberies, authorities believe the same knife was brandished to get the cash and cigarettes, but no one was hurt.He is due back in court on April 16 for a pre-trial conference.A conviction on armed robbery carries a potential life sentence in state prison.Assistant District Attorney James P. Gubitose is prosecuting the case for the state and Mark Schmidt, a public defender, is representing Arroyo.