This happened on 1st February, 2011, at the very start of the Arab Spring. "Khaybar Khaybar ya yahud, Jaish Muhammad saya'ud," which translates as "Jews, remember Khaybar, the army of Mohammed is returning." This refers to a genocidal attack led by Mohammed upon the peaceful Jewish town of Khaybar. In order to avoid accusations of Islamophobia, the description of the battle of
Khaybar will be left to Bukhari, Tabari & Ishaq:





Bukhari, Volume 5, Book 59, Number 510:
Allah's Apostle reached Khaybar
at night & it was his habit that, whenever he reached the enemy at night, he
will not attack them till it was morning. When it was morning, the Jews came out
with their spades & baskets, & when they saw him, they said, "Mohammed!
By Allah! Mohammed & his army!" The Prophet said, "Khaybar is destroyed, for
whenever we approach a nation, then evil will be the morning for those who have
been warned."
Bukhari, Volume 5, Book 59, Number 512:
The Prophet offered the Fajr
Prayer near Khaybar when it was still dark & then said, "Allahu-Akbar!
Khaybar is destroyed, for whenever we approach a nation, then evil will be the
morning for those who have been warned." Then the inhabitants of Khaybar came
out running on the roads. The Prophet had their warriors killed, their offspring
& woman taken as captives. Safiya was amongst the captives. She first came
in the share of Dahya Alkali but later on she belonged to the Prophet. The
Prophet made her manumission as her 'Mahr'.
Tabari, VIII:116:
"So Mohammed began seizing their herds & their
property bit by bit. He conquered Khaybar home by home. The first stronghold
defeated was Naim. Next was Qamus, the community of Abi Huqayq. The Messenger
took some of its people captive, including Safiya bint Huyayy, the wife of
kinana & her two cousins. The Prophet chose Safiya for himself."
Tabari, VIII:117:
"Dahya had asked the Messenger for Safiya when the
Prophet chose her for himself. Mohammed gave Dahya her two cousins instead."
Ishaq's Sira, Chapter 20, Paragraph 5:
The Muslims were in the habit of
eating the flesh of their own donkeys, but on this day the apostle made various
prohibitions for the future; no Believer was to eat the flesh of tame donkeys.
Although the apostle of Allah forbade this flesh, he permitted consumption of
horseflesh. He also declared, 'It is not lawful for a Believer to irrigate
another man's harvest [to have intercourse with pregnant captives]; nor shall
any Believer have intercourse with a captive woman until she has been purified;
neither shall a Believer ride a captured animal which has not been assigned to
him & return it, emaciated, to the joint stock of plunder; neither shall he
wear a captured garment & return it, worn out, to the stock of plunder.'
Ishaq's Sira, Chapter 20, Paragraph 11:
Kinana, the husband of Safiya,
had been guardian of the tribe's treasures, & he was brought before the
apostle, who asked where they were hidden. But Kinana refused to disclose the
place. Then a Jew came who said, 'I have seen Kinana walk around a certain ruin
every morning.' The apostle asked Kinana, 'Art thou prepared to die if we find
thou knewest where the treasure was?' And he replied, 'Yes.' So the apostle
ordered the ruin to be dug up, & some of the treasure was found. After that
Kinana was asked again about the remainder, but he still refused to tell. The
apostle of Allah handed him over to al-Zubayr, saying, 'Torture him until he
tells what he knows', & al-Zubayr kindled a fire on his chest so that he
almost expired; then the apostle gave him to Mohammed bin Maslama, who struck
off his head.