LONDON — More than 26 people were killed and dozens more were injured overnight in Pakistan by Indian aerial attacks, Pakistani officials said, adding that the assault amounted to a “blatant act of aggression.”

The strikes, which had began with missile attacks early on Tuesday, came amid rising tension as India continued to blame Pakistan for a deadly attack in April in the disputed Kashmir region. That militant attack, known as the Pahalgam incident, left 26 people dead in Indian-held Kashmir.

Pakistani military officials on Tuesday had vowed to respond from the “air and ground.” The Indian Army confirmed New Delhi’s latest strikes on Wednesday, saying in a statement that its forces were “responding appropriately in a calibrated manner.”

At least 46 people were injured in Pakistan, military spokesperson Lt. Gen. Ahmed Sharif Chaudhry said in a press conference on Wednesday.

Pakistan’s Ministry of Foreign Affairs said it had summoned India’s top diplomat in Pakistan.

The attack “constitutes a clear violation of Pakistan’s sovereignty,” the ministry said in a statement, adding, ” The Indian side was warned that such reckless behavior poses a serious threat to regional peace and stability.”

This is a developing story. Please check back for updates.

ABC News’ Meredith Deliso contributed to this report.