Concord police are investigating racist and antisemitic graffiti on the Merrimack River Greenway Trail, which was vandalized sometime between Sunday evening and Monday morning.

Both the notice boards and the paved path were marked with references to Nazism, Hitler, Zionism, white power and the n-word. Another marking said “Wake Up NH” with two S’s beneath NH.

Parks and recreation employees found the graffiti around 9 a.m. on Monday …