The first UAE alert in more than a month was sparked by the firing of two Iranian ballistic missiles, the Ministry of Defence said on Wednesday.
One landed in Emirati territorial waters, while the second landed outside its territory.
UAE air defence systems were alerted on Tuesday evening, the first such incident since mid-July.
A phone alert was sent at 6.52pm, followed by the all-clear 10 minutes later. The alert was mostly sent to residents in Dubai and Sharjah.
The ministry said it remained on high alert and fully prepared to deal with any threat.
The alert was the first since July 12. On that day, the National Emergency Crisis and Disasters Management Authority detected a missile threat but later said no projectile entered UAE territory.
