The words say "No running away from the 'Flood of Fire' " - which is what they named yesterday's attack near Hebron. The road sign shows the sign for "Bani Naim" which is the Arab village near that attack, and the question mark indicates that more such attacks are to come.
In the article where they take credit for the Ramallah attack today, they say explicitly that "Flood of Fire" is meant to be a series of attacks, not a single operation.They also say that "this operation will not be the last." Moreover, they have choice words about the "wimps" of the PA and their attempts to capture them.
(h/t Ali for translation)