Pakistani media quoted unnamed law enforcement officers as saying that servicemen were continuing to blow holes in the wall and barricades surrounding the complex using controlled explosions.
Pakistani security forces detonated eight warning explosions near the mosque early Thursday to encourage entrenched religious students to surrender.
"So far, we have not made attempts to enter the mosque and the seminary, but we are prepared to do that," a senior security official told the press.
Suggestions have been made that the blasts were set off to blow holes in the wall surrounding the mosque and the adjacent seminary in preparation for a possible attack on the building.
Red Mosque students, who advocate the practice of strict Islamic values, have been entrenched inside since shootouts Tuesday with police and troops, which left at least 12 people dead and more than 100 injured.
Many conservative Islamists in Pakistan are deeply critical of President Pervez Musharraf's support of the U.S.-led antiterrorism campaign in neighboring Afghanistan, and violent clashes between demonstrators and Pakistani troops in recent weeks have killed scores of people.
