Story highlights The victim, a member of the Israel Defense Forces, is in serious condition, police say

Police call the stabbing a terrorist attack by a Palestinian

Palestinian party Fatah cancels memorial for former Palestinian leader Yasser Arafat

Fatah blames rival Hamas, saying it's been bombing Fatah leaders' homes

(CNN) First, a 20-year-old Israeli was stabbed Monday at a bus stop in Tel Aviv. Then, three Israelis were stabbed at a hitchhiking post near the entrance to a settlement in the West Bank, police said.

One of the three, a 24-year-old woman, was killed, emergency services said.

In both incidents, the attackers were "terrorists," police said. The incidents came amid simmering tensions -- not just between Israel and Palestinians, but between rival Palestinian factions as well.

"The atmosphere of violence rides the wave of Palestinian incitement," Israeli military spokesman Lt. Col. Peter Lerner said on Twitter.

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After the Tel Aviv stabbing, a Palestinian suspect from Nablus in the West Bank was arrested "with the help of eyewitnesses while he was hiding in an apartment building in the fourth floor nearby the central bus station," police spokeswoman Luba Samri said.

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