Here is the latest Iowa news from The Associated Press at 4:50 a.m. CDT

IOWA CITY, Iowa (AP) — The 14th Iowa City Zombie March takes place Sept. 21 in downtown Iowa City. Zombies will assemble at College Green Park, and assistance with zombie make-up will be available starting at 4 p.m. The march will begin promptly at 5:30 p.m., when participants will shamble through Iowa City, ending with an after-party. Proceeds from the march will go to support programs to feed the hungry, homeless and at-risk.

DES MOINES, Iowa (AP) — Iowa’s attorney general says his office is joining a multistate investigation to determine whether Facebook has violated any antitrust laws. Attorney General Tom Miller says Facebook’s dominance over communications and information is concerning and warrants the investigation he’s leading along with 8 other attorneys general. Miller says the goal is to determine whether Facebook’s actions “may have endangered user data, reduced the quality of consumers’ choices, or stifled competition.”

FORT MADISON, Iowa (AP) — Officials say the Sheaffer Pen Museum has reopened in Fort Madison. The museum closed in May last year amid financial concerns and worries about the fate of company archives. The Fort Madison Daily Democrat reports that the archives had been on loan from A.T. Cross, Sheaffer’s owner. The museum board president, Tim Gobble, says Cross has agreed to donate virtually all of the company archives to the museum. Grants and other financial pledges of support since have allowed the museum to reopen.