A man arrested over a series of 18 attacks in three US states was ordered held without bond in one case after being extradited to Michigan.
Elias Abuelazam appeared in court via video-link to answer a charge of assault with intent to murder in Flint, Michigan, where 14 attacks took place.
The 33-year-old is expected to face more charges in other states.
Mr Abuelazam, an Israeli citizen, was arrested at an airport in Atlanta, Georgia, two weeks ago.
"This is one of 14 incidents of murder and assault with intent to murder. Five people are dead. The rest faced death and are seriously injured," Genesee County Prosecutor David Leyton told the judge, asking for a bail of $10m (£6.4m).
The stabbings, which police suspect were racially-motivated, occurred on average about once every four days between the end of May and the beginning of August.
The suspect was arrested at Atlanta's Hartsfield-Jackson airport as he tried to board a Delta Air Lines flight to Tel Aviv in Israel.
Mr Abuelazam is an Israeli citizen and permanent US resident.
He grew up in a Christian Arab community in Ramla, in central Israel, newspaper reports in Israel say.