Israel and the Palestinian Hamas movement in the Gaza Strip carried out rocket attacks on each other on Monday.
According to the Palestinian Ministry of Health, nine people were killed in an Israeli attack on northern Gaza.
Nothing is yet known about Israeli victims of Palestinian missiles, which would have ended up in the vicinity of Jerusalem.
Earlier in the day, Hamas had issued an ultimatum to Israel.
If the country didn't remove security forces and settlers from an Arab neighborhood in Jerusalem, Hamas would go on the offensive.
The movement is said to have fired several missiles, one of which has been intercepted by anti-aircraft guns.
At the same time, it has been troubled in Jerusalem since Friday because of the planned deportation of at least 60 Palestinian families in East Jerusalem.
They have to make way for Jewish settlers.
The Supreme Court has yet to rule on this.
A lawsuit about this would take place on Monday, but it has been postponed.
In parts of the city, this led to clashes between protesters and the police.
Palestinians throw stones, while the police use flash grenades, tear gas and rubber bullets.
By now 305 people are said to have been injured, seven of whom are in danger of death.
Police are reporting 21 injured officers.
Due to the unrest, hundreds of Jewish believers had to be evacuated on Monday.
The Israeli parliament complex has also been evacuated.
Israel also celebrates Jerusalem Day on Monday, an annual holiday that commemorates the 1967 conquest of East Jerusalem. The authorities had already decided that Jewish groups should not be allowed to visit the vicinity of the Al Aqsa Mosque to prevent further unrest.