Error detection: Islamabad is further from Lahore than it.
Error detection: Islamabad is further from Lahore than it.
Explanation
The sentence: "Islamabad is further from Lahore than it."
The word "further" is incorrect in comparison between two places (distance).
For physical distance, we use "farther", not "further."
Correct sentence: Islamabad is farther from Lahore than it.