Even though i am in favour of women being able to pray their own way - also with tallit and tefillin if they wish - it was clear that this time there would be an enormous clash between the haredi women whop were called in by the haredi rabbis, and the women of the wall. The police probably was afraid that hey could not protect them inside the womens' section. and for the comments that last month police banned Jewish men from approaching the Wall - that is because these men were intent to disturb the womens' prayer service, just like they did now.
Yemeni Shiite rebels to form own Cabinet in 10 days (AP)
from the article: Women of the Wall pray under police protection away from the Kotel