"tightened security measures" is correct and can be used in written English
It typically refers to an increase in the level of security protocols or precautions being taken. Example: After the recent break-in, the company has implemented tightened security measures, including installing security cameras and hiring additional guards.
He gave no details on when and how Hadi broke tightened security measures around his house.
Doors opened early because of the pouring rain, though newly tightened security measures, including metal detectors, slowed down the stampede.
He said that tightened security measures increased the losses among all ethnic groups, but that the economy and other effects contributed.
The official added that the tightened security measures were planned in conjunction with security agencies in Europe and the Middle East.
But the announcement of tightened security measures is more unusual, coming less than a week after a suicide bomber managed to bring explosives into the International Zone and set off a bomb just outside the gates of Parliament.
But since the 1990s, when Israel began requiring permits for the entry of Palestinians and tightened security measures as a result of terrorism, the West Bank Kabhas have been prohibited from crossing over the road into Israel.
China tightens security measures for the anniversary each year.
The crime wave has spurred pharmacists to tighten security measures and add ones they may never have imagined.
The American Embassy in Berlin said it would tighten security measures at diplomatic and consular facilities in Germany because of a "heightened security threat".
Several violent episodes, including attacks on government forces, led the authorities to tighten security measures across Xinjiang for much of 2008.
Kuwait's ruler has ordered the authorities to tighten security measures and make arrests if necessary after protesters stormed parliament in anger at claims of high-level corruption.
