Police in Biloxi and Gulfport are investigating unrelated assaults and a robbery that resulted in arrests over the weekend. The Harrison County jail docket shows Rayfiel Demond Gill, 26, of Gulfport was jailed early Saturday and charged with aggravated assault with a knife. Gulfport police made that arrest. The docket also shows two unrelated arrests by Biloxi police. Collier C. Lewis, 43, of Biloxi, was jailed Friday on a charge of armed robbery of a person with a knife. Police also arrested Kenneth Wayne Payton, 53, of Biloxi, on a charge of aggravated assault. Details were not immediately available from police. The Sun Herald updates these stories in Tuesday's editions.