Sin City is under siege by a plague of grasshoppers.

Swarms of insects have descended on Las Vegas this week. Attracted by bright lights, the bugs have stormed the strip in numbers of biblical proportion.

“When I see them, it’s like being in a movie. Never seen nothing like this ever!” Lyft driver Jessica Palmore told CNN. “I know they are harmless, but they make me super itchy seeing them.”

Though they have unsettled locals and may even seem like divine punishment, the grasshoppers are in fact the result of unique weather conditions.

“It appears through history that when we have a wet winter or spring, these things build up often down below Laughlin and even into Arizona,” Jeff Knight, a local entomologist explained to CNN. “We’ll have flights about this time of the year, migrations, and they’ll move northward.”

Knight added that he could recall about four or five other grasshopper invasions over the last 30 years.

The bugs are so pervasive they are believed to also be interfering with the state’s meteorological data, showing up as rain on Las Vegas Doppler radar.