In Tin Shui Wai, protesters besieged and started a fire inside the police station. In Sha Tin, a police van was lit on fire. A volunteer paramedic reported that at least 70 protesters were injured. The university gym room was turned into a field hospital to treat the wounded. Five students arrested inside the campus were charged with the offence of rioting. The police announced that 142 people were arrested on 12 November. Police reported that they had used about 1,567 canisters of tear gas, 1,312 shots of rubber bullets, 380 shots of bean bag rounds, and 126 shots of sponge grenades to disperse the protesters. After the confrontations at CUHK and other universities on 12 November, protesters turned the university campuses into their strongholds. Supplies were delivered to them by supporters of the protesters from various districts in Hong Kong. Expecting the riot police to return, some of the protesters stayed in CUHK and slept in the car park and the sportsgrounds. In the morning of 13 November, protesters fortified the campuses by constructing roadblocks and barricades using bricks and furniture such as tables and chairs at major entrances near the university. Supplies from supporters, including medical bandages and food, were delivered to various universities in Hong Kong. A gym room inside CUHK was converted into a first-aid station. Protesters also practised throwing petrol bombs inside the campus, set up caltrops, took away sports equipment such as bows and arrows, javelins, and rackets, and set up makeshift catapults. Media noted that protesters were recreating "Medieval weapons". CUHK senior management cancelled all classes for the remaining semester. The president of the CUHK student union applied for an interim injunction to stop the police from entering the university campuses without proper warrant, though the court dismissed the application. The police sent one of their boats to CUHK to evacuate a group of mainland Chinese students from the university, after they had expressed concerns with safety at the campus; the police said the students were unable to leave the campus by road due to obstructions. The Taipei Economic and Cultural Office in Hong Kong sent representatives to CUHK and arranged 85 Taiwanese students to take the flights to return to Taiwan. At 3 am, three masked protesters at CUHK held a press conference. They indicated an intention to reopen one lane in each direction of the Tolo Highway as a symbol of good faith, demanding the government hold the 2019 Hong Kong local elections as scheduled on 24 November, release arrested people and establish an independent commission of inquiry within 24 hours.