A Palestinian girl plays outside her family structure after it was demolished by Israeli forces, April 7

UNITED NATIONS — In the past three months, the Israeli military has more than tripled its demolitions of Palestinian homes in the occupied West Bank, United Nations’ figures show, raising alarm among diplomats and human rights groups over what they regard as a sustained violation of international law.

Figures collated by the U.N.’s office for the coordination of humanitarian affairs (OCHA), which operates in Gaza, the West Bank and East Jerusalem, show that from an average of 50 demolitions a month in 2012-2015, the average has risen to 165 a month since January, with 235 demolitions in February alone.

The Israeli military, occupies the West Bank and enforces an apartheid system, says it carries out the demolitions because the structures are illegal: they were either built without a permit, in a closed military area or firing zone, or violate other planning and zoning restrictions.

The U.N. and rights groups point out that permits are almost impossible for Palestinians to acquire, that firing zones are often declared but seldom used, and that many planning restrictions date from the British Mandate in the 1930s.

The structures include houses, Bedouin tents, livestock pens, outhouses and schools. In an increasing number of cases, they also include humanitarian structures erected by the European Union to help those affected by earlier demolitions.