The phrase "again intensified" is correct and usable in written English.
It can be used to describe a situation or feeling that has become stronger or more severe once more.
Example: "The storm's fury was again intensified, causing widespread damage across the region."
Alternatives: "further heightened" or "increased once more".
In early July 1995, fighting again intensified.
Bombing again intensified as night fell, cutting power in some regions.
Thereafter, fighting between the guerrillas and the government again intensified until February 2002, when the government and the LTTE signed a permanent cease-fire agreement.
In rats, the E. coli again intensified inflammation to gluten, prompting what's sometimes called a "leaky gut" — the milieu suspected of contributing to celiac disease.
After an aid convoy was destroyed near Aleppo, fighting again intensified and the US and Russia exchanged accusations in the UN.
In early May, when the vigour of the eruption again intensified, the atmospheric flow turned northwesterly and remained through the latter half of May although the strength of the air flow gradually weakened.
That pressure is only likely to build with fears that violence will again intensify as suicide attacks in Israel have resumed.
BERLIN — With Greece's membership in the euro zone teetering, fears of bank insolvency rising and Europe's leaders bickering about what to do, the euro crisis is once again intensifying and threatening to undermine fragile growth globally.
This latest reverse will again intensify the scrutiny on the former Forest left-back after Saturday's win at Derby briefly relieved the pressure on the beleaguered boss.
A bullet hole in the plane's wing from a guerrilla's potshot is a reminder that the Lord's Resistance Army LRAA) still operates in these badlands, where war is again intensifying.
The "border crisis" was one of the biggest challenges faced by the U.S. in 2014, and as summer and its devastating heat approaches, the dangers to crossers again intensify.
